JP2011192405A - Dye-sensitized solar cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dye-sensitized solar cell of low cost, high corrosion resistance against iodide ions, and of high quality with less degradation with time. <P>SOLUTION: The dye-sensitized solar cell 10 includes: an oxide semiconductor electrode base plate 1 formed on a first electrode base material 11 and having a porous layer 12 containing metal oxide semiconductor fine particles with a dye-sensitizing agent carried on the surface; and a counter electrode base plate 2 equipped with a catalyst layer 22 formed on a second electrode base material 21 are arranged so that the porous layer 12 and the catalyst layer 22 are opposed to each other with an interposition of electrolyte. In the dye-sensitized solar cell 10, either the first electrode base material 11 or the second electrode base material 21 contains Cr within a range of 18 to 24%, Mo within a range of 0 to 4%, and N within a range of 0.3 to 1.5% by mass%, and that, has a stainless steel base material made of stainless steel not containing Ni as an electrode layer, and the other is a base material having transparency. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a dye-sensitized solar cell that can prevent corrosion of an electrode substrate due to iodide ions in an electrolyte layer, and that is high quality and low cost.

  In recent years, environmental problems such as global warming caused by an increase in carbon dioxide have become serious, and countermeasures are being promoted worldwide. In particular, active research and development on solar cells using solar energy as a clean energy source with a low environmental impact is underway. As such solar cells, single crystal silicon solar cells, polycrystalline silicon solar cells, amorphous silicon solar cells, compound semiconductor solar cells and the like have already been put into practical use, but these solar cells have high production costs, etc. There is a problem. Therefore, as a solar cell that has a small environmental load and can reduce the manufacturing cost, a dye-sensitized solar cell has been attracting attention and research and development have been promoted.

  An example of a general configuration of the dye-sensitized solar cell is shown in FIG. As illustrated in FIG. 9, a general dye-sensitized solar cell 100 is formed on a first electrode substrate 111 having a function as an electrode, and the first electrode substrate 111, and the dye-sensitizer. On the surface of the oxide semiconductor electrode substrate 110 having the porous layer 112 containing the metal oxide semiconductor fine particles supported on the surface, the second electrode base material 121 having a function as an electrode, and the second electrode base material 121 The counter electrode substrate 120 having the catalyst layer 122 formed on the electrode layer 120 is disposed so that the porous layer 112 and the catalyst layer 122 face each other, and a redox pair is formed between the oxide semiconductor electrode substrate 110 and the counter electrode substrate 120. The electrolyte layer 103 is formed, and the end portion of the dye-sensitized solar cell 100 is sealed with the sealant 104. The dye sensitizer adsorbed on the surface of the metal oxide semiconductor fine particles in the porous layer 112 is excited by receiving sunlight from the first electrode substrate 111 side, and the excited electrons are converted into the first electrode group. Conducted to the material 111 and conducted to the second electrode substrate 121 through an external circuit. Thereafter, electricity is generated by returning the electrons to the ground level of the dye sensitizer via the redox couple. In FIG. 9, as the first electrode substrate 111, an electrode substrate in which the transparent electrode layer 111 a is formed on the transparent first substrate 111 b is used, and the second electrode substrate 121 is transparent. In the dye-sensitized solar cell, sunlight is used as the first electrode substrate or the second electrode substrate, in which the transparent electrode layer 121a is formed on the second substrate 121b. Since light is received from one side of the two-electrode base material, any one of the electrode base materials may be a base material having transparency.

  In recent years, there has been an increasing demand for a large area of the above-described dye-sensitized solar cell. By applying a metal film to the electrode layer used for the first electrode base material or the second electrode base material, Attempts have also been made to increase the electricity extraction efficiency even in the area element. However, since an electrolyte containing iodide ions is used for the electrolyte layer of the dye-sensitized solar cell, the electrode layer has excellent corrosion resistance stably against iodide ions for a long period of time. It is necessary to use metal. Examples of such metals include titanium and noble metals. However, when these are used in the electrode layer of a dye-sensitized solar cell, there is a problem that the manufacturing cost increases.

  Therefore, it has been studied to use stainless steel as an inexpensive material to replace the titanium, noble metal, etc. as the material of the electrode layer (Patent Document 1). However, conventional electrode layers using stainless steel are inferior in corrosion resistance to iodide ions compared to titanium, noble metals, etc., and it is difficult to have corrosion resistance to the extent that it can be put to practical use. there were. Therefore, stainless steel having high corrosion resistance against iodide ions is required as an electrode layer of a dye-sensitized solar cell (Patent Document 2).

  Here, SUS304 is generally used as a conventional stainless steel, and the composition range of SUS304 is C: 0.08% or less, Si: 1. 00% or less, Mn: 2.00% or less, P: 0.045% or less, S: 0.03% or less, Ni: 8.00% to 10.00%, Cr: 18.00% to 20.00 %.

Japanese Industrial Standard JIS G4303: 2005

JP 2006-318770 A JP 2009-26532 A

  The present invention uses stainless steel having high corrosion resistance against iodide ions for the electrode layer of the first electrode substrate or the second electrode substrate, so that the influence of corrosion due to iodide ions is low and the electrode is low in cost. The main object is to provide a high-quality dye-sensitized solar cell with little deterioration of the layer over time.

  As a result of intensive studies, the present inventor has found that the corrosion of stainless steel by iodide ions is caused by Ni contained in the stainless steel. As a result, Ni-free stainless steel was found to have excellent corrosion resistance against iodide ions, and the present invention was achieved.

  That is, the present invention provides a first electrode substrate having a function as an electrode, and a porous material including metal oxide semiconductor fine particles formed on the first electrode substrate and having a dye sensitizer supported on the surface. An oxide semiconductor electrode substrate having a porous layer, a second electrode base material having a function as an electrode, and a counter electrode substrate having a catalyst layer formed on the second electrode base material, the porous layer and The dye-sensitized solar cell, wherein the catalyst layer is disposed so as to face each other, and an electrolyte layer including a redox pair is formed between the oxide semiconductor electrode substrate and the counter electrode substrate, Either one of the electrode base material and the second electrode base material has a Cr content in the range of 18% to 24%, Mo in the range of 0% to 4%, and N in the range of 0.3% to 1%. .5% of stainless steel that does not contain Ni Having Nresu steel substrate as an electrode layer and the other to provide a dye-sensitized solar cell, which is a base material having transparency.

  According to the present invention, by using the stainless steel substrate as an electrode layer of the first electrode substrate or the second electrode substrate of the dye-sensitized solar cell, an electrode layer having high corrosion resistance against iodide ions. Therefore, a high-quality dye-sensitized solar cell with little deterioration of the electrode layer with time can be obtained. In addition, since the stainless steel is less expensive than the case where titanium, noble metal, or the like is used as the material for the electrode layer, a dye-sensitized solar cell can be obtained at low cost.

  In this invention, it is preferable that the said 2nd electrode base material has the said stainless steel base material as an electrode layer, and the said 1st electrode base material is a base material which has transparency. With the above configuration, it is possible to receive sunlight from the oxide semiconductor electrode substrate side, and light can be incident on the dye sensitizer in the porous layer with minimal loss of light. it can.

  In the present invention, the first electrode substrate has the stainless steel substrate as an electrode layer, and has a conductive buffer layer on the stainless steel substrate surface, and the second electrode. The substrate is preferably a transparent substrate. Electrons may not flow easily from the porous layer to the stainless steel substrate due to the difference in energy level (having an energy gap). In this case, the performance of the dye-sensitized solar cell may be degraded. However, by having the buffer layer, it is possible to prevent the performance of the dye-sensitized solar cell from being deteriorated.

  The present invention provides a first electrode base material having a function as an electrode, and a porous layer formed on the first electrode base material and containing metal oxide semiconductor fine particles having a dye sensitizer supported on the surface. An oxide semiconductor electrode substrate comprising: a second electrode base material having a function as an electrode; and a counter electrode substrate having a catalyst layer formed on the second electrode base material, the porous layer and the catalyst A dye-sensitized solar cell, wherein an electrolyte layer including a redox pair is formed between the oxide semiconductor electrode substrate and the counter electrode substrate, wherein the first electrode At least one of the base material or the second electrode base material is a transparent base material, and Cr is in the range of 18% to 24%, Mo is in the range of 0% to 4%, N. In the range of 0.3% to 1.5% and containing no Ni Provided is a dye-sensitized solar cell comprising a mesh-like stainless steel auxiliary electrode base material made of tenres steel.

  According to the present invention, by using the above-mentioned stainless steel auxiliary electrode base material, a transparent electrode layer having high corrosion resistance against iodide ions can be obtained, so that the electrode layer has high quality with little deterioration over time. A dye-sensitized solar cell can be obtained. In addition, since the stainless steel is less expensive than the case of using titanium or a noble metal as the electrode layer of the dye-sensitized solar cell, a dye-sensitized solar cell can be obtained at a low cost.

  In the present invention, the second electrode substrate preferably has the stainless steel auxiliary electrode substrate. Thereby, it can be set as a dye-sensitized solar cell with high electric power generation efficiency.

  In the present invention, it is preferable that at least a part of the stainless steel is austenitized. Thereby, the intensity | strength of the said stainless steel and the corrosion resistance with respect to iodide ion can be made high.

  The present invention provides a first electrode base material having a function as an electrode, and a porous layer formed on the first electrode base material and containing metal oxide semiconductor fine particles having a dye sensitizer supported on the surface. An oxide semiconductor electrode substrate comprising: a second electrode base material having a function as an electrode; and a counter electrode substrate having a catalyst layer formed on the second electrode base material, the porous layer and the catalyst An electrolyte layer including a redox couple is formed between the oxide semiconductor electrode substrate and the counter electrode substrate, and the first electrode base material or the second electrode base material is disposed between the oxide semiconductor electrode substrate and the counter electrode substrate. One of them contains Cr in a range of 18% to 24% by mass, Mo in a range of 0% to 4%, N in a range of 0.3% to 1.5%, and Ni A stainless steel substrate made of stainless steel that is not Dye-sensitized solar cell is a substrate having a gender to provide a dye-sensitized solar cell module which is characterized by comprising a plurality connected.

  The present invention also includes a first electrode substrate having a function as an electrode, and a porous material including metal oxide semiconductor fine particles formed on the first electrode substrate and having a dye sensitizer supported on the surface. An oxide semiconductor electrode substrate having a porous layer, a second electrode base material having a function as an electrode, and a counter electrode substrate having a catalyst layer formed on the second electrode base material, the porous layer and An electrolyte layer including a redox pair is formed between the oxide semiconductor electrode substrate and the counter electrode substrate, and the first electrode substrate or the second electrode substrate. Is a base material having transparency, and Cr is in a range of 18% to 24%, Mo is in a range of 0% to 4%, and N is in a range of 0.3% to 1.5% by mass. % Mesh and made of stainless steel not containing Ni Provided is a dye-sensitized solar cell module comprising a plurality of dye-sensitized solar cells connected to each other having a stainless steel auxiliary electrode substrate.

  According to the present invention, by having the above-described dye-sensitized solar cell, the electrode layer of the first electrode base material or the second electrode base material is not easily affected by iodide ion corrosion and deteriorates over time. Therefore, a high-quality dye-sensitized solar cell module can be obtained.

  According to the present invention, stainless steel having high corrosion resistance against iodide ions is used as the material of the electrode layer of the first electrode substrate or the second electrode substrate, so that the influence of corrosion by iodide ions is small. Therefore, a high-quality dye-sensitized solar cell with little deterioration of the electrode layer with time can be obtained. Moreover, since the stainless steel mentioned above is cheap compared with titanium, a noble metal, etc., a dye-sensitized solar cell can be obtained at low cost.

It is a schematic sectional drawing which shows an example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows another example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows another example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows another example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows another example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows another example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows an example of the dye-sensitized solar cell module of this invention. It is a schematic sectional drawing which shows another example of the dye-sensitized solar cell module of this invention. It is a schematic sectional drawing which shows an example of a dye-sensitized solar cell.

  Hereinafter, the dye-sensitized solar cell and the dye-sensitized solar cell module of the present invention will be described respectively.

A. First, the dye-sensitized solar cell of the present invention will be described.
Here, in this invention, when showing both a 1st electrode base material and a 2nd electrode base material, it may only express with an electrode base material. Further, the electrode base material is not particularly limited as long as it has at least an electrode layer, and may be composed of only an electrode layer or formed on the base material and the base material. In addition, a member having an electrode layer may be used, or necessary members may be added in addition to the configuration described above.

In recent years, it has been studied to apply a metal film to an electrode layer used for the first electrode substrate or the second electrode substrate described above.
However, the electrolyte used for the dye-sensitized solar cell usually contains iodide ions, and the iodide ions are known to be highly corrosive to many metal materials. When a metal film is used for the electrode layer, corrosion of the electrode layer due to iodide ions becomes a problem. A problem that occurs when the iodide ion corrodes the electrode layer made of the metal film includes a decrease in the current value of the dye-sensitized solar cell. Although the reason for this is not clear, it can be considered as follows.
That is, when an electrode layer made of the above metal or the like used in a dye-sensitized solar cell reacts with iodide ions, metal iodide is generated. In addition, the produced metal iodide is deposited on the surface of the electrode layer, or when metal ions eluted from the electrode layer react with the iodide ions in the electrolyte layer. In some cases, iodide ions in the electrolyte layer may decrease, or problems such as inhibiting the transfer of electrons may be considered.

  Therefore, as the electrode layer of the dye-sensitized solar cell, it is necessary to use a metal material that hardly reacts with iodide ions and has high corrosion resistance against iodide ions. Examples of such metal materials include titanium and noble metals. However, since these metal materials are all expensive, there is a problem that the manufacturing cost of the dye-sensitized solar cell is increased.

  On the other hand, in the present invention, Cr is contained in a range of 18% to 24% by mass, Mo is in a range of 0% to 4%, N is in a range of 0.3% to 1.5%, and By using stainless steel that does not contain Ni as a material for the electrode layer, an electrode layer that exhibits corrosion resistance against iodide ions equivalent to the metal materials such as Ti and noble metals described above can be obtained at a lower cost than the above metal materials. Is possible. Therefore, in the present invention, a dye-sensitized solar cell can be obtained at low cost.

  Note that the analytical sampling method and analysis method used when analyzing the composition of the stainless steel used in the present invention is based on JIS G0321 (a steel product analysis method and its allowable variation value).

Here, the reason why the stainless steel exhibits high corrosion resistance against iodide ions is not clear, but is considered as follows.
First, it is conceivable that the stainless steel exhibits high corrosion resistance due to a high content of Cr having high corrosion resistance against iodide ions. In addition, it is considered that the stainless steel exhibits high corrosion resistance because it does not contain Ni, which has low corrosion resistance to iodide ions. In addition to the ferrite-based crystal structure, the stainless steel can be at least partially austenitic, and the austenitic stainless steel has higher corrosion resistance than the ferrite structure. Therefore, the stainless steel can exhibit high corrosion resistance against iodide ions. Further, in general stainless steel, Ni is required to fix the austenite system, but the stainless steel used in the present invention can fix the austenite system by N, and Ni It can be considered that high corrosion resistance can be exhibited also from the fact that the structure can be made free of.

  The dye-sensitized solar cell of the present invention is roughly classified into two embodiments according to the configuration of the electrode substrate. Each embodiment will be described below.

I. Dye-sensitized solar cell according to the first embodiment The dye-sensitized solar cell according to the present embodiment is formed on a first electrode base material having a function as an electrode and the first electrode base material. An oxide semiconductor electrode substrate having a porous layer containing metal oxide semiconductor fine particles supported on its surface, a second electrode substrate having a function as an electrode, and the second electrode substrate An electrolyte layer including a redox pair disposed between the oxide semiconductor electrode substrate and the counter electrode substrate, the counter electrode substrate having the formed catalyst layer disposed so that the porous layer and the catalyst layer face each other In which either one of the first electrode base material and the second electrode base material is Cr in a range of 18% to 24% by mass, and Mo is Within the range of 0% to 4%, N within the range of 0.3% to 1.5% It has a stainless steel substrate made of stainless steel that contains Ni and does not contain Ni as an electrode layer, and the other is a transparent substrate.

  According to this embodiment, since either one of the first electrode base material or the second electrode base material has the stainless steel base material as an electrode layer, it has corrosion resistance against iodide ions in the electrolyte layer. Since a high electrode layer can be obtained, it is possible to obtain a high-quality dye-sensitized solar cell with little deterioration over time of the electrode layer. Further, since the stainless steel is less expensive than the material of the electrode layer such as titanium or noble metal, a dye-sensitized solar cell can be obtained at low cost.

  Here, as the dye-sensitized solar cell of the present embodiment, specifically, the first electrode base material is a transparent base material, and the second electrode base material is the stainless steel base. An embodiment having a material as an electrode layer (hereinafter referred to as a first embodiment), the first electrode substrate having the stainless steel substrate as an electrode layer, and the second electrode substrate having transparency. There are two possible modes: the base material having the base material (hereinafter referred to as the second mode). Hereinafter, the dye-sensitized solar cell of each aspect will be described.

1. Dye-sensitized solar cell according to the first aspect In the dye-sensitized solar cell according to the present aspect, the first electrode base material is a transparent base material, and the second electrode base material is the stainless steel base. It has a material as an electrode layer.

The dye-sensitized solar cell of this embodiment will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the dye-sensitized solar cell of this embodiment.
As shown in FIG. 1, the dye-sensitized solar cell 10 of this embodiment is formed on a first electrode substrate 11 that is a transparent substrate, and the first electrode substrate 11, and is a dye sensitizer. , An oxide semiconductor electrode substrate 1 having a porous layer 12 containing metal oxide semiconductor fine particles carried on its surface, a second electrode substrate 21 having a stainless steel substrate as an electrode layer, and a second electrode substrate 21 The counter electrode substrate 2 having the catalyst layer 22 formed thereon is disposed so that the porous layer 12 and the catalyst layer 22 face each other, and the redox pair is interposed between the oxide semiconductor electrode substrate 1 and the counter electrode substrate 2. The electrolyte layer 3 containing is formed. Further, the stainless steel base material includes Cr in a range of 18% to 24% by mass, Mo in a range of 0% to 4%, and N in a range of 0.3% to 1.5%. And it consists of stainless steel which does not contain Ni. Furthermore, the 1st electrode base material 11 has the transparent base material 11b and the transparent electrode layer 11a formed on the transparent base material 11b. In this embodiment, the end portion of the dye-sensitized solar cell 10 is normally sealed with the sealing agent 4.
Hereinafter, each member used for the dye-sensitized solar cell of this embodiment will be described.

(1) Counter electrode substrate First, the counter electrode substrate used in this embodiment will be described.
The counter electrode substrate used in this embodiment has a second electrode base material having a function as an electrode, and a catalyst layer formed on the second electrode base material. Hereinafter, the second electrode substrate and the catalyst layer will be described respectively.

(A) 2nd electrode base material The 2nd electrode base material used for this aspect is Cr in the range of 18% to 24%, Mo in the range of 0% to 4%, and N in the range of 0.3%. It has a stainless steel base material made of stainless steel which is contained within the range of% to 1.5% and does not contain Ni as an electrode layer.

  Here, “Ni-free” means that the stainless steel is excellent in corrosion resistance to iodide ions as long as it is below the amount inevitably mixed during the steel making and steel making for obtaining the stainless steel. It can be.

  In the stainless steel used for the stainless steel substrate, the Cr content is in the range of 18% to 24%. In the stainless steel, when the Cr content is less than 18%, it becomes difficult for the stainless steel to contain N within the above range, and it becomes difficult to make the stainless steel highly resistant to iodide ions. Become. Further, since the maximum content of Cr that can have corrosion resistance to the extent that it is used as the second electrode substrate in this embodiment is 24%, the above range is adopted. Further, in the stainless steel, as the Cr content increases, N becomes easier to enter and can contribute to improvement of various mechanical properties and corrosion resistance against iodide ions.

  In the stainless steel, the Mo content is in the range of 0% to 4%. The addition of Mo not only promotes the absorption of N, but also improves the resistance to stress corrosion cracking (SCC). However, if its content exceeds 4%, the processing for obtaining the stainless steel having the above composition is required. Because it becomes difficult.

  Such a stainless steel substrate is not particularly limited as long as it has the above-described composition, and may be a ferritic stainless steel, or may be a part of austenitic ferritic stainless steel. Alternatively, all may be austenitic stainless steel. Especially, it is preferable that it is a ferritic stainless steel partially austenitized or a stainless steel fully austenitized. This is because by making the stainless steel austenitized, it becomes possible to increase the corrosion resistance against iodide ions and the strength of the stainless steel substrate.

As for the stainless steel used for the stainless steel base material, which is at least partially austenitic, it can be obtained, for example, by the following processing.
First, a ferritic stainless steel base material containing Cr in a range of 18% to 24% and Mo in a range of 0% to 4% by mass% is prepared, and this is combined with an inert gas containing nitrogen gas and 800%. Nitrogen absorption treatment is performed by contact at a temperature of at least ° C. Thereby, the ferritic stainless steel can be austenitized in whole or in part, and has excellent strength and corrosion resistance, and can be a stainless steel substrate that does not contain Ni.

  In addition, the second electrode substrate used in this embodiment is not particularly limited as long as it has the stainless steel substrate as an electrode layer, and only the stainless steel substrate may be used. And the board | substrate with which the electrode layer which consists of the said stainless steel base material is arrange | positioned on a base material may be used. In addition, about the said base material, since it can be made to be the same as that used for a general electrode member, description here is abbreviate | omitted.

  When the 2nd electrode base material in this aspect consists only of the said stainless steel base material, it has a function as an electrode layer as a film thickness of the said stainless steel base material, and has a catalyst layer on a stainless steel base material. Although it will not specifically limit if it is a film thickness which can be used as a counter-electrode board | substrate by forming, It exists in the range of 1 micrometer-200 micrometers, especially the range of 5 micrometers-100 micrometers, especially the range of 5 micrometers-50 micrometers. It is preferable to be within. If the thickness of the stainless steel substrate exceeds the above range, it is because a thin film dye-sensitized solar cell that has been increasingly demanded in recent years cannot be formed. This is because if it is less than the range, it may not have a self-supporting property that can be used as a counter electrode substrate.

(B) Catalyst layer The catalyst layer used for this aspect is formed on the 2nd electrode base material mentioned above.

  By forming the catalyst layer on the second electrode substrate, the dye-sensitized solar cell of this embodiment can be made more excellent in power generation efficiency. Examples of such a catalyst layer include, for example, an embodiment in which Pt is vapor-deposited on the second electrode substrate, polyethylene dioxythiophene (PEDOT), polystyrene sulfonic acid (PSS), polyaniline (PA), paratoluene sulfone. Although the aspect which forms a catalyst layer from an acid (PTS) and these mixtures can be mentioned, it is not this limitation.

  As the film thickness of such a catalyst layer, it can be formed on the second electrode substrate, and particularly if the dye-sensitized solar cell of this embodiment can be made excellent in power generation efficiency. Although it is not limited, it is preferably in the range of 1 nm to 10 μm, in particular, in the range of 10 nm to 1000 nm, particularly in the range of 10 nm to 500 nm. If the film thickness of the catalyst layer exceeds the above range, it takes a lot of time for the material of the catalyst layer, the time for forming the catalyst layer, and the like. Because it becomes. Moreover, when it is less than the said range, it is because it is difficult to form a catalyst layer on the said 2nd electrode base material.

(2) Oxide Semiconductor Electrode Substrate The oxide semiconductor electrode substrate used in this embodiment is formed on the first electrode base material having a function as an electrode and the first electrode base material, and the dye sensitizer is on the surface. It has a porous layer containing metal oxide semiconductor fine particles carried on. Hereinafter, the 1st electrode base material and porous layer which are used for this mode are explained, respectively.

(A) 1st electrode base material The 1st electrode base material used for this aspect is a base material which has transparency. The transparency of the first electrode substrate used in this embodiment is such that the dye-sensitized solar cell of this embodiment can exhibit its function by receiving sunlight from the oxide semiconductor electrode substrate side. The light transmittance is not particularly limited as long as it can transmit sunlight, but the total light transmittance is preferably 50% or more. The transparency of the first electrode substrate is a value measured by a measurement method based on JIS K7361-1: 1997.

  Such a substrate having transparency usually has a transparent substrate and a transparent electrode layer formed on the transparent substrate. Hereinafter, each of the transparent substrate and the transparent electrode layer will be described.

(I) Transparent base material The transparent base material used in this embodiment is not particularly limited as long as it has a self-supporting property capable of forming a transparent electrode layer and a porous layer described later. . As such a transparent substrate, for example, an inorganic transparent substrate or a resin substrate can be used. Among these, the resin base is preferable because it is lightweight, has excellent processability, and can reduce manufacturing costs.

  Examples of the resin base material include an ethylene / tetrafluoroethylene copolymer film, a biaxially stretched polyethylene terephthalate film, a polyethersulfone (PES) film, a polyetheretherketone (PEEK) film, and a polyetherimide (PEI). ) Film, polyimide (PI) film, polyester naphthalate (PEN), substrate made of resin such as polycarbonate (PC), and the like. In particular, in this embodiment, it is preferable to use a biaxially stretched polyethylene terephthalate film (PET), a polyester naphthalate film (PEN), or a polycarbonate film (PC).

  Examples of the inorganic transparent substrate include a synthetic quartz substrate and a glass substrate.

  Further, the thickness of the transparent substrate used in this embodiment can be appropriately selected according to the use of the dye-sensitized solar cell, but it is usually in the range of 10 μm to 2000 μm. In particular, it is preferably in the range of 50 μm to 1800 μm, more preferably in the range of 100 μm to 1500 μm.

Moreover, it is preferable that the transparent base material used for this aspect is excellent in heat resistance, a weather resistance, water vapor | steam, and other gas barrier properties. This is because when the transparent substrate has gas barrier properties, for example, the temporal stability of the dye-sensitized solar cell of this embodiment can be increased. In particular, in this embodiment, the oxygen transmission rate is 1 cc / m ² / day · atm or less under the condition of a temperature of 23 ° C. and a humidity of 90%, and the water vapor transmission rate is 1 g under the condition of a temperature of 37.8 ° C. and a humidity of 100%. It is preferable to use a transparent substrate having a gas barrier property of / m ² / day or less. In this aspect, in order to achieve such gas barrier properties, a material in which an arbitrary gas barrier layer is provided on the transparent substrate may be used. The oxygen permeability is a value measured using an oxygen gas permeability measuring device (manufactured by Modern Control Co., Ltd., OX-TRAN 2/20: trade name). The water vapor transmission rate is a value measured using a water vapor transmission rate measuring device (manufactured by Modern Control Co., Ltd., PERMATRAN-W 3/31: trade name).

(Ii) Transparent electrode layer The transparent electrode layer used in the present embodiment is not particularly limited as long as it has transparency and predetermined conductivity. Examples of the material used for such a transparent electrode layer include metal oxides and conductive polymer materials.

Examples of the metal oxide include SnO ₂ , ZnO, a compound in which tin is added to indium oxide (ITO), a compound in which zinc oxide is added to indium oxide (IZO), and the like. In this embodiment, any of these metal oxides can be suitably used, but among these, fluorine-doped SnO ₂ (hereinafter referred to as FTO) and ITO are preferably used. This is because FTO and ITO are excellent in both conductivity and sunlight permeability.
On the other hand, examples of the conductive polymer material include polythiophene, polyethylene sulfonic acid (PSS), polyaniline (PA), polypyrrole, and polyethylenedioxythiophene (PEDOT). Moreover, these can also be used in mixture of 2 or more types.

  The transparent electrode layer used in this embodiment may be composed of a single layer, or may be composed of a plurality of layers laminated. Examples of the configuration in which a plurality of layers are stacked include a mode in which layers made of materials having different work functions are stacked, and a mode in which layers made of different metal oxides are stacked.

The thickness of the transparent electrode layer used in the present embodiment is not particularly limited as long as desired conductivity can be achieved according to the use of the dye-sensitized solar cell. In particular, the film thickness of the transparent electrode layer in this embodiment is usually preferably in the range of 5 nm to 2000 nm, and particularly preferably in the range of 10 nm to 1000 nm. If the thickness is thicker than the above range, it may be difficult to form a homogeneous transparent electrode layer, or the total light transmittance may be lowered and it may be difficult to obtain good photoelectric conversion efficiency. If the thickness is thinner than the above range, the conductivity of the transparent electrode layer may be insufficient.
In addition, the said thickness shall point out the total thickness which totaled the thickness of all the layers, when a transparent electrode layer is comprised from a several layer.

  Since the method for forming the transparent electrode layer on the transparent substrate can be the same as a general method for forming an electrode layer, description thereof is omitted here.

(Iii) Other Configurations As described above, the first electrode base material in this aspect is not particularly limited as long as it has the transparent base material and the transparent electrode layer described above, and a necessary configuration is selected. Can be added. An example of such a configuration is an auxiliary electrode layer.

  The auxiliary electrode layer is an electrode layer formed in a mesh shape using a conductive material. By using the auxiliary electrode layer together with the transparent electrode layer described above, the power generation efficiency of the dye-sensitized solar cell of this embodiment can be increased.

  The formation position of the auxiliary electrode layer used in this embodiment is particularly limited as long as it can be used together with the transparent electrode layer to increase the power generation efficiency of the dye-sensitized solar cell of this embodiment. Instead, it may be formed on the transparent electrode layer formed on the transparent substrate, or may be formed between the transparent substrate and the transparent electrode layer. In this aspect, the auxiliary electrode layer is more preferably formed between the transparent substrate and the transparent electrode layer. This is because, compared with the case where the auxiliary electrode layer is formed on the transparent electrode layer formed on the transparent base material, it is difficult to come into contact with iodide ions in the electrolyte layer.

The material for the auxiliary electrode layer used in this embodiment is not particularly limited as long as it is a material that can increase the power generation efficiency of the dye-sensitized solar cell of this embodiment.
In this embodiment, even if the auxiliary electrode layer is formed on the transparent substrate and further the transparent electrode layer is formed, iodide ions contained in the electrolyte layer described later are used for the transparent electrode layer. Since it partially permeates and comes into contact with the auxiliary electrode layer, the auxiliary electrode layer preferably has corrosion resistance against iodide ions.
Specific examples of the material used for such an auxiliary electrode layer include titanium, tungsten, molybdenum, chromium, and platinum. However, any metal that has been subjected to a corrosion-resistant surface treatment using plating or the like may be used. For example, common metal species such as aluminum, nickel, copper, iron, silver, and alloys thereof can be used.

  As a method for forming such an auxiliary electrode layer, a method for forming the auxiliary electrode layer by using a vapor deposition method such as a sputtering method using a metal mask, or a method for forming the auxiliary electrode layer material film as a transparent substrate or a transparent electrode layer. Examples thereof include a method of forming the entire surface on top and etching into a predetermined pattern, a method of using the auxiliary electrode layer material as a metal paste, and printing the metal paste on a transparent substrate or a transparent electrode layer, and the like.

  In addition, in this aspect, the stainless steel auxiliary electrode base material demonstrated by the term of "II. Dye-sensitized solar cell of 2nd embodiment" mentioned later can be used as said auxiliary electrode layer. Further, the shape of the mesh of the auxiliary electrode layer used in this embodiment, the ratio of the openings of the auxiliary electrode layer, the mesh pitch, the line width, and the like will be described later in “II. Dye-sensitized solar cell of the second embodiment” Since it can be the same as that of the stainless steel auxiliary electrode substrate described in the section, the description is omitted here.

  The 1st electrode base material used for this aspect can select and add a required member besides the said auxiliary electrode layer.

(B) Porous layer Next, the porous layer used in this embodiment will be described. The porous layer used in this embodiment contains metal oxide semiconductor fine particles having a dye sensitizer supported on the surface, is formed on the above-described first electrode substrate, and is an electrolyte described later. It is in contact with the layer. Moreover, in this aspect, since the said 1st electrode base material has a transparent base material and a transparent electrode layer, the said porous layer is formed in the transparent electrode layer side surface of the said 1st electrode base material. It is what is done.
Hereinafter, the metal oxide semiconductor fine particles and the dye sensitizer used in the porous layer will be described.

(I) Metal oxide semiconductor fine particles The metal oxide semiconductor fine particles used in this embodiment are not particularly limited as long as they are made of a metal oxide having semiconductor characteristics. Examples of the metal oxide constituting the metal oxide semiconductor fine particles used in this embodiment include TiO ₂ , ZnO, SnO ₂ , ITO, ZrO ₂ , MgO, Al ₂ O ₃ , CeO ₂ , Bi ₂ O ₃ , and Mn. ₃ O ₄ , Y ₂ O ₃ , WO ₃ , Ta ₂ O ₅ , Nb ₂ O ₅ , La ₂ O _{3 and the} like can be mentioned. These metal oxide semiconductor fine particles are suitable for forming a porous porous layer, and can be suitably used in this embodiment because energy conversion efficiency can be improved and costs can be reduced.

Among these, in this embodiment, it is most preferable to use metal oxide semiconductor fine particles made of TiO ₂ . This is because TiO ₂ is particularly excellent in semiconductor characteristics.

The average particle diameter of the metal oxide semiconductor fine particles used in this embodiment is not particularly limited as long as the specific surface area of the porous layer can be within a desired range, but is usually in the range of 1 nm to 10 μm. The inside is preferable, and it is particularly preferable to be within the range of 10 nm to 1000 nm. If the average particle size is smaller than the above range, the respective metal oxide semiconductor fine particles may aggregate to form secondary particles. If the average particle size is larger than the above range, the porous layer becomes thicker. This is because the porosity of the porous layer, that is, the specific surface area may be reduced. Here, when the specific surface area of the porous layer becomes small, for example, it may be difficult to carry a dye sensitizer sufficient for photoelectric conversion in the porous layer.
The average particle size of the metal oxide semiconductor fine particles means the primary particle size.

(Ii) Dye sensitizer The dye sensitizer used in the present embodiment is not particularly limited as long as it can absorb light and generate an electromotive force. Examples of such a dye sensitizer include organic dyes and metal complex dyes. Examples of the organic dyes include acridine, azo, indigo, quinone, coumarin, merocyanine, phenylxanthene, indoline, and carbazole dyes. In this embodiment, among these organic dyes, a coumarin dye is preferably used. Further, as the metal complex dye, it is preferable to use a ruthenium dye, and it is particularly preferable to use a ruthenium bipyridine dye and a ruthenium terpyridine dye which are ruthenium complexes. This is because such a ruthenium complex has a wide wavelength range of light to be absorbed, so that the wavelength range of light that can be photoelectrically converted can be greatly expanded.

(Iii) Arbitrary component The porous layer used in this embodiment may contain an arbitrary component in addition to the metal oxide semiconductor fine particles. As an arbitrary component used for this aspect, binder resin can be mentioned, for example. This is because the porous layer used in this embodiment can be made less brittle by containing the binder resin in the porous layer.

  Examples of such a binder resin include polyvinyl pyrrolidone, ethyl cellulose, caprolactan, and the like.

(Iv) Others The thickness of the porous layer used in this embodiment can be appropriately determined according to the use of the dye-sensitized solar cell of this embodiment, and is not particularly limited. In particular, the thickness of the porous layer in this aspect is usually preferably in the range of 1 μm to 100 μm, and particularly preferably in the range of 3 μm to 30 μm. This is because if the thickness of the porous layer is larger than the above range, the porous layer itself tends to cause cohesive failure, which tends to cause membrane resistance. In addition, if the thickness of the porous layer is thinner than the above range, it becomes difficult to form a porous layer having a uniform thickness, the amount of the dye sensitizer carried is reduced, and the sunlight is sufficiently absorbed. This is because it may not be able to absorb and may cause poor performance.

(3) Electrolyte layer The electrolyte layer used in this embodiment is formed between the oxide semiconductor electrode substrate and the counter electrode substrate, and includes an oxidation-reduction pair. In addition, it is located between the porous layer and the catalyst layer, and transports when the electric charge conducted from the porous layer is transported to the porous layer through the first electrode substrate and the second electrode substrate. It is.

The redox couple used for the electrolyte layer in this embodiment is a combination of iodine and iodide.
Examples of the combination of iodine and iodide used in this embodiment as the redox couple, for example, can be cited LiI, NaI, KI, and metal iodide such as CaI _2, a combination of I _2.

  The electrolyte layer in this embodiment may contain additives such as a crosslinking agent, a photopolymerization initiator, a thickener, and a room temperature molten salt as other compounds other than the redox couple.

The electrolyte layer used in this embodiment may be an electrolyte layer having any form of gel, solid or liquid. When the electrolyte layer is in a gel form, it may be either a physical gel or a chemical gel. Here, the physical gel is gelled near room temperature due to physical interaction, and the chemical gel is a gel formed by chemical bonding by a crosslinking reaction or the like.
When the electrolyte layer is in a liquid state, for example, acetonitrile, methoxyacetonitrile, propylene carbonate, or the like as a solvent and an ionic liquid containing a redox couple or an imidazolium salt as a cation is used as the solvent. It can be.
Further, when the electrolyte layer is in a solid state, it does not include a redox pair and may function as a hole transporting agent itself. For example, a hole transporting agent containing CuI, polypyrrole, polythiophene, etc. It may be.

(4) Other members The dye-sensitized solar cell of the present embodiment is not particularly limited as long as it has the above-described oxide semiconductor electrode substrate, counter electrode substrate, and electrolyte layer. Can be added. Examples of such a member include a sealing agent used for sealing an end portion of the dye-sensitized solar cell. Since the sealing agent can be the same as that used in general dye-sensitized solar cells, description thereof is omitted here.

2. Next, the dye-sensitized solar cell of the second embodiment will be described.
In the dye-sensitized solar cell of this embodiment, the first electrode base material has the stainless steel base material as an electrode layer, and the second electrode base material is a transparent base material. .

The dye-sensitized solar cell of this embodiment will be described with reference to the drawings. FIG. 2 is a schematic cross-sectional view showing an example of the dye-sensitized solar cell of this embodiment. As shown in FIG. 2, the dye-sensitized solar cell 10 of this embodiment is formed on a first electrode substrate 11 having a stainless steel substrate as an electrode layer, and the first electrode substrate 11, and is dye-sensitized. Oxide semiconductor electrode substrate 1 having porous layer 12 containing metal oxide semiconductor fine particles supported on its surface, second electrode substrate 21 as a transparent substrate, and second electrode substrate The counter electrode substrate 2 having the catalyst layer 22 formed on the electrode 21 is disposed so that the porous layer 12 and the catalyst layer 22 face each other, and the oxidation-reduction is performed between the oxide semiconductor electrode substrate 1 and the counter electrode substrate 2. An electrolyte layer 3 including a pair is formed. Moreover, the 2nd electrode base material 21 has the transparent base material 21b and the transparent electrode layer 21a formed on the transparent base material 21b. In this embodiment, the end portion of the dye-sensitized solar cell 10 is normally sealed with the sealing agent 4.
Moreover, in FIG. 2, the 1st electrode base material 11 has the buffer layer 13 which consists of a material which has the corrosion resistance with respect to iodide ion on the stainless steel base material surface. The stainless steel substrate is made of the stainless steel described in FIG.

The electrolyte layer and other members used in this embodiment can be the same as those described in the section of “1. Dye-sensitized solar cell of the first embodiment”, so description thereof is omitted here. .
Hereinafter, each of the oxide semiconductor electrode substrate and the counter electrode substrate used in this embodiment will be described.

(1) Oxide Semiconductor Electrode Substrate The oxide semiconductor electrode substrate used in this embodiment is formed on the first electrode base material having a function as an electrode and the first electrode base material, and the dye sensitizer is It has a porous layer containing metal oxide semiconductor fine particles carried on its surface.
The porous layer used in this embodiment can be the same as that described in the section of “1. Dye-sensitized solar cell of the first embodiment”, and thus the description thereof is omitted here.

  The 1st electrode base material used for this mode is Cr in the range of 18% to 24%, Mo in the range of 0% to 4%, and N in the range of 0.3% to 1.5% by mass%. It has a stainless steel substrate made of stainless steel that is contained inside and does not contain Ni as an electrode layer. Such a stainless steel substrate can be the same as that used for the second electrode substrate described in the section “1. Dye-sensitized solar cell of the first aspect”. Description is omitted.

  Moreover, in this aspect, it is preferable to have a buffer layer having conductivity on the surface of the stainless steel substrate of the first electrode substrate.

By forming the buffer layer on the surface of the stainless steel substrate, the power generation efficiency of the dye-sensitized solar cell of this embodiment can be increased. The reason for this is not clear, but it is estimated as follows.
In the porous layer containing the stainless steel substrate and the metal oxide semiconductor fine particles, the difference in energy levels is large, and it is considered that electrons are difficult to move between the stainless steel substrate and the porous layer.
On the other hand, since the buffer layer is formed between the stainless steel substrate and the porous layer, the difference in energy level can be filled, so the stainless steel substrate and the porous layer are interposed via the buffer layer. It is thought that electrons easily move between the layers.

  The material of the buffer layer is not particularly limited as long as it has conductivity. In this embodiment, it is preferable that the material has corrosion resistance against iodide ions. Specific examples of such a buffer layer material include Ti, ITO, Cr, and the like.

  The method for forming the buffer layer is not particularly limited as long as a buffer layer having a predetermined film thickness can be formed on the surface of the stainless steel substrate. Specifically, a sputtering method is used. A vapor deposition method such as a CVD method or a vacuum vapor deposition method can be used.

The thickness of the buffer layer is not particularly limited as long as the power generation efficiency of the dye-sensitized solar cell of this embodiment can be increased, but it is 1000 nm or less. preferable.
If the thickness of the buffer layer exceeds the above range, it takes a lot of material and manufacturing time for the buffer layer, so it is difficult to reduce the manufacturing cost even when an inexpensive stainless steel substrate is used as the electrode layer. Because it becomes.
Here, when a buffer layer having a film thickness within the above range is formed by vapor deposition or the like using the material of the buffer layer, the buffer layer becomes a vapor deposition film having a large surface roughness. In this case, even if the buffer layer is formed on the surface of the stainless steel substrate, iodide ions contained in the electrolyte layer pass through the buffer layer and come into contact with the stainless steel substrate. The effect of the high corrosion resistance against iodide ions of the stainless steel substrate to be obtained can be exhibited greatly.
In addition, the buffer layer is preferably a thin film as long as the power generation efficiency of the dye-sensitized solar cell of this embodiment can be increased, and the lower limit thereof is about 1 nm.

(2) Counter electrode substrate The counter electrode substrate used in this embodiment has a second electrode base material and a catalyst layer formed on the second electrode base material. The catalyst layer used in this embodiment can be the same as that described in the section of “1. Dye-sensitized solar cell of the first embodiment”, and thus description thereof is omitted here.

  Moreover, the 2nd electrode base material used for this aspect is a base material which has transparency. Such a second electrode base material can be the same as the first electrode base material described in the section of “1. Dye-sensitized solar cell of the first aspect”. It can have a material and a transparent electrode layer. Moreover, you may use an auxiliary electrode layer with the said transparent electrode layer. Further, as the auxiliary electrode layer, a stainless steel auxiliary electrode base material described in the section of “II. Dye-sensitized solar cell of second embodiment” described later may be used as the auxiliary electrode layer. The second electrode substrate may be the same as the first electrode substrate described in the section “1. Dye-sensitized solar cell of the first aspect” in detail. Omitted. Moreover, in this aspect, since the said 2nd electrode base material consists of a transparent base material and a transparent electrode layer, the said catalyst layer is what is formed in the transparent electrode layer side surface of the said 2nd electrode base material. It is.

3. Others As the dye-sensitized solar cell of the present embodiment, the dye-sensitized solar cell of the first embodiment among the dye-sensitized solar cell of the first embodiment and the dye-sensitized solar cell of the second embodiment described above. A solar cell is more preferable. This is because the dye-sensitized solar cell of the first aspect is superior in power generation efficiency.

II. Dye-sensitized solar cell according to the second embodiment The dye-sensitized solar cell according to the present embodiment is formed on the first electrode base material having a function as an electrode and the first electrode base material. An oxide semiconductor electrode substrate having a porous layer containing metal oxide semiconductor fine particles supported on its surface, a second electrode substrate having a function as an electrode, and the second electrode substrate An electrolyte layer including a redox pair disposed between the oxide semiconductor electrode substrate and the counter electrode substrate, the counter electrode substrate having the formed catalyst layer disposed so that the porous layer and the catalyst layer face each other Is formed, wherein at least one of the first electrode substrate and the second electrode substrate is a transparent substrate, and Cr is 18% by mass. In the range of ˜24%, Mo in the range of 0% to 4%, The is characterized in that it has a 0.3% includes within 1.5% of the range, and the mesh-shaped stainless steel auxiliary electrode base material made of stainless steel that does not contain Ni.

  According to this embodiment, since at least one of the first electrode base material or the second electrode base material has the stainless steel auxiliary electrode base material, the corrosion resistance to iodide ions in the electrolyte layer is high. Since it can be used as a transparent electrode layer, a high-quality dye-sensitized solar cell with little deterioration over time of the electrode layer can be obtained. In addition, since the stainless steel is less expensive than the case where titanium, noble metal, or the like is used as the material of the electrode layer of the dye-sensitized solar cell, a dye-sensitized solar cell can be obtained at a low cost.

  Here, as the dye-sensitized solar cell of this embodiment, specifically, at least the first electrode base material is a base material having transparency, and has the stainless steel auxiliary electrode base material. And the embodiment (hereinafter referred to as the third embodiment) and the embodiment in which at least the second electrode substrate is a transparent substrate and has the stainless steel auxiliary electrode substrate (hereinafter referred to as the following) Two aspects are possible: the fourth aspect. Hereinafter, each aspect will be described.

1. Dye-sensitized solar cell according to the third aspect The dye-sensitized solar cell according to the present aspect is one in which at least the first electrode base material is a base material having transparency and the above-mentioned stainless steel auxiliary electrode base material. It is.

The dye-sensitized solar cell of this embodiment will be described with reference to the drawings. FIG. 3 is a schematic cross-sectional view showing an example of the dye-sensitized solar cell of this embodiment.
As shown in FIG. 3, the dye-sensitized solar cell 10 of this embodiment includes a transparent base material 11b and a first electrode base material having a mesh-like stainless steel auxiliary electrode base material 11c formed on the transparent base material 11b. 11 and an oxide semiconductor electrode substrate 1 having a porous layer 12 containing metal oxide semiconductor fine particles on the surface of which a dye sensitizer formed on the first electrode substrate 11 is supported, and a transparent substrate The porous electrode 12 includes the second electrode substrate 21 having the transparent electrode layer 21a formed on the transparent substrate 21b and the counter electrode substrate 2 having the catalyst layer 22 formed on the second electrode substrate 21. And the catalyst layer 22 are arranged to face each other, and an electrolyte layer 3 including a redox pair is formed between the oxide semiconductor electrode substrate 1 and the counter electrode substrate 2. In this embodiment, the stainless steel auxiliary electrode base material 11c is, by mass%, Cr in the range of 18% to 24%, Mo in the range of 0% to 4%, and N in the range of 0.3% to 1.5%. And made of stainless steel that does not contain Ni. In general, the end of the dye-sensitized solar cell 10 is sealed with the sealant 4. Moreover, when the 1st electrode base material 11 has the stainless steel auxiliary electrode base material 11c, it is preferable that the transparent electrode layer 11a is used with the stainless steel auxiliary electrode base material 11c (in the figure, a stainless steel auxiliary electrode base material). This shows an example in which a transparent electrode layer 11a is formed on 11c).
Hereinafter, each member used for the dye-sensitized solar cell of this embodiment will be described.

(1) Oxide Semiconductor Electrode Substrate The oxide semiconductor electrode substrate used in this embodiment is formed on the first electrode base material and the first electrode base material, and a metal having a dye sensitizer carried on the surface. It has a porous layer containing oxide semiconductor fine particles. Here, the porous layer can be the same as that described in the section “I. Dye-sensitized solar cell of the first embodiment”, and thus the description thereof is omitted here.

Moreover, the 1st electrode base material used for this aspect is a base material which has transparency, and has the said stainless steel auxiliary electrode base material.
Such transparency of the first electrode base material can be the same as that described in the section of “I. Dye-sensitized solar cell of first embodiment”, and thus description thereof is omitted here. To do.

  As such a 1st electrode base material, it has the said stainless steel auxiliary electrode base material normally formed on the transparent base material and a transparent base material. The transparent substrate can be the same as that described in the section “I. Dye-sensitized solar cell of the first embodiment”, and thus the description thereof is omitted here. Hereinafter, the stainless steel auxiliary electrode base material will be described.

(A) Stainless steel auxiliary electrode base material The stainless steel auxiliary electrode base material used in this embodiment is Cr in a range of 18% to 24%, Mo in a range of 0% to 4%, and N in 0% by mass. It is made of stainless steel that is contained within the range of 3% to 1.5% and does not contain Ni, and is formed in a mesh shape.
The stainless steel auxiliary electrode substrate is formed on a transparent substrate and serves as an electrode layer.

  As the shape of the mesh of the stainless steel auxiliary electrode substrate, the dye-sensitized solar cell according to the present embodiment can function as an electrode layer and allows sunlight to pass through the opening of the mesh. However, it is preferable that the solar cell can operate by sufficiently receiving sunlight from the first electrode substrate side. Specific examples include a triangular lattice shape, a parallelogram lattice shape, and a hexagonal lattice shape.

  The film thickness of the stainless steel auxiliary electrode substrate is not particularly limited as long as the first electrode substrate can have a function as an electrode layer, but the range is 0.01 μm to 10 μm. Among them, it is particularly preferable that the thickness be in the range of 0.1 μm to 5 μm, particularly in the range of 0.2 μm to 1 μm. When the thickness of the stainless steel auxiliary electrode substrate exceeds the above range, it is difficult for the first electrode substrate used in this aspect to have the predetermined transparency necessary for transmitting sunlight. It is. In addition, since it takes a lot of materials and time for forming the stainless steel auxiliary electrode base material, the production efficiency is lowered and the production cost is increased. Further, when the thickness of the stainless steel auxiliary electrode base material is less than the above range, the stainless steel auxiliary electrode base material may not sufficiently perform the function as an electrode layer.

  The ratio of the openings of the stainless steel auxiliary electrode substrate used in this embodiment is that the dye-sensitized solar cell of this embodiment can operate by receiving sunlight from the first electrode substrate side. There is no particular limitation. The ratio of the openings of such a stainless steel auxiliary electrode substrate is in the range of 1% to 99.9%, in particular in the range of 40% to 98%, particularly in the range of 70% to 95%. It is preferable. When the ratio of the openings of the stainless steel auxiliary electrode base material is less than the above range, the dye-sensitized solar cell of this aspect cannot sufficiently receive sunlight from the first electrode base material side, This is because power generation efficiency may be reduced. Moreover, when the ratio of the opening part of the said stainless steel auxiliary electrode base material exceeds the said range, it is because the said stainless steel auxiliary electrode base material may not fully fulfill | perform the function as an electrode layer.

  The line width and mesh pitch of the stainless steel auxiliary electrode substrate are not particularly limited as long as the first electrode substrate can function as an electrode, and the dye-sensitized type used The line width of the stainless steel auxiliary electrode base material is within the range of 0.02 μm to 10 mm, especially within the range of 1 μm to 2 mm, especially 10 μm to The mesh pitch of the stainless steel auxiliary electrode substrate is preferably in the range of 1 mm, and in the range of 1 μm to 500 μm, in particular in the range of 5 μm to 100 μm, particularly in the range of 10 μm to 50 μm. preferable.

  About the stainless steel used for the said stainless steel auxiliary electrode base material, since it can be the same as that of the item of the stainless steel base material of "I. Dye-sensitized solar cell of 1st aspect", it is here The description in is omitted.

  A method for forming such a stainless steel auxiliary electrode base material can be the same as the method for forming the auxiliary electrode layer described in the section “I. Dye-sensitized solar cell of the first embodiment” described above. Therefore, explanation here is omitted.

(2) Other Configurations The first electrode substrate of this embodiment is not particularly limited as long as it has a transparent substrate and a stainless steel auxiliary electrode substrate, but usually the above-mentioned stainless steel auxiliary electrode substrate. In addition, a transparent electrode layer is used. This is because the function as the electrode layer can be greatly improved. Such a transparent electrode layer can be the same as that described in the section “I. Dye-sensitized solar cell of the first embodiment”, and thus the description thereof is omitted here.

  In this embodiment, when the transparent electrode layer is provided, the transparent electrode layer 11a may be formed on the stainless steel auxiliary electrode substrate 11c formed on the transparent substrate 11b, for example, as shown in FIG. Further, as shown in FIG. 4, the transparent electrode layer 11a may be formed on the transparent substrate 11b, and the stainless steel auxiliary electrode substrate 11c may be formed on the transparent electrode layer 11a.

  Moreover, as shown in FIG. 4, when the transparent electrode layer 11a is formed on the transparent substrate 11b and the stainless steel auxiliary electrode substrate 11c is formed on the transparent electrode layer 11a, the stainless steel auxiliary electrode substrate It is preferable that the buffer layer 13 is formed on the surface of 11c. Here, the reason why the buffer layer is preferably formed, and the buffer layer may be the same as those described in the section “I. Dye-sensitized solar cell of the first embodiment”. Since it is possible, explanation here is omitted. Also, reference numerals not described in FIG. 4 can be the same as those in FIG.

  Necessary members other than the transparent electrode layer and the buffer layer can be appropriately added to the first electrode substrate used in this embodiment.

(2) Counter electrode substrate The counter electrode substrate used in this embodiment has a second electrode base material and a catalyst layer formed on the second electrode base material. The catalyst layer used in this embodiment can be the same as that described in the section “I. Dye-sensitized solar cell of the first embodiment”, and thus the description thereof is omitted here.

In the dye-sensitized solar cell of this embodiment, since the first electrode substrate is a transparent substrate, the second electrode substrate is a transparent substrate and a non-transparent substrate. Both of these can be used. As the second electrode substrate, for example, in the case of a transparent substrate, the second electrode substrate described in the section “2. Dye-sensitized solar cell of the fourth aspect” described later, and “I The base material which consists of a transparent base material and the transparent electrode layer which were demonstrated in the term of "the dye-sensitized solar cell of 1st embodiment" etc. can be mentioned.
Moreover, in the case of the base material which does not have transparency, the stainless steel base material demonstrated in the term of "I. Dye-sensitized solar cell of 1st embodiment" can be mentioned.

(3) Electrolyte layer The electrolyte layer used in this embodiment can be the same as that described in the section of “I. Dye-sensitized solar cell of the first embodiment”, so the description here is Omitted.

2. Dye-sensitized solar cell according to the fourth aspect The dye-sensitized solar cell according to the fourth aspect is one in which at least the second electrode base material is a base material having transparency and the above-mentioned stainless steel auxiliary electrode base material. It is.

The dye-sensitized solar cell of this embodiment will be described with reference to the drawings. FIG. 5 is a schematic cross-sectional view showing an example of the dye-sensitized solar cell of this embodiment.
As shown in FIG. 5, the dye-sensitized solar cell 10 of the present embodiment includes a first electrode substrate 11 having a transparent substrate 11b and a transparent electrode layer 11a formed on the transparent substrate 11b, and a first electrode An oxide semiconductor electrode substrate 1 having a porous layer 12 containing metal oxide semiconductor fine particles supported on the surface of a dye sensitizer formed on the transparent electrode layer 11a of the electrode substrate 11, and a transparent substrate 21b Second electrode substrate 21 and second electrode having mesh-like stainless steel auxiliary electrode substrate 21c formed on transparent substrate 21b and transparent electrode layer 21a formed on stainless steel auxiliary electrode substrate 21c The counter electrode substrate 2 having the catalyst layer 22 formed on the base material 21 is disposed so that the porous layer 12 and the catalyst layer 22 face each other, and between the oxide semiconductor electrode substrate 1 and the counter electrode substrate 2. Includes redox couple In which the electrolyte layer 3 is formed. In this embodiment, the stainless steel auxiliary electrode base material 11c is, by mass%, Cr in the range of 18% to 24%, Mo in the range of 0% to 4%, and N in the range of 0.3% to 1.5%. And made of stainless steel that does not contain Ni. Moreover, the edge part of a dye-sensitized solar cell is normally sealed with the sealing agent 4.

  Hereinafter, each member used for the dye-sensitized solar cell of this embodiment will be described.

(1) Counter electrode substrate The counter electrode substrate used in this embodiment has a second electrode base material and a catalyst layer formed on the second electrode base material. The catalyst layer can be the same as that described in the section “I. Dye-sensitized solar cell of the first embodiment”, and thus the description thereof is omitted here.

  The 2nd electrode base material used for this aspect is a base material which has transparency, and has the stainless steel auxiliary electrode base material mentioned above. Such a second electrode substrate usually has a transparent substrate and a stainless steel auxiliary electrode substrate. Such a transparent substrate and a stainless steel auxiliary electrode substrate can be the same as those described in the section of “1. Dye-sensitized solar cell of the third aspect”. Omitted.

  In the 2nd electrode base material used for this aspect, as shown in FIG. 6, for example, the structure of the 2nd electrode base material 21 is the stainless steel auxiliary electrode formed on the transparent base material 21b and the transparent base material 21b. Even if it is the structure which has the catalyst layer 22 formed on the base material 21c and the stainless steel auxiliary electrode base material 21c, although it can fully function as an electrode, in order to provide a higher function As shown in FIG. 5, the transparent electrode layer 21a can be used together with the stainless steel auxiliary electrode substrate 21c. In FIG. 6, reference numerals that are not described may be the same as those in FIG. 5, and thus description thereof is omitted here.

  Although not shown, when both the stainless steel auxiliary electrode substrate and the transparent electrode layer are used, the transparent electrode layer is formed on the transparent substrate, and the stainless steel auxiliary electrode substrate is formed on the transparent electrode layer. It may be. In such a configuration, the catalyst layer is formed on the surface of the stainless steel auxiliary electrode substrate.

  The arrangement of the transparent electrode layer and the stainless steel auxiliary electrode base material and the transparent electrode layer can be the same as those described in the section “1. Dye-sensitized solar cell of the third aspect”. Therefore, explanation here is omitted.

  Moreover, in the 2nd electrode base material used for this aspect, the catalyst layer formed on a 2nd electrode base material is a buffer layer demonstrated in the term of "1. Dye-sensitized solar cell of 3rd aspect." Therefore, it is not necessary to form a buffer layer on the stainless steel auxiliary electrode base material.

(2) Oxide Semiconductor Electrode Substrate The oxide semiconductor electrode substrate used in this embodiment is a first electrode base material and a metal formed on the first electrode base material and having a dye sensitizer carried on the surface. It has a porous layer containing oxide semiconductor fine particles. Here, the porous layer can be the same as that described in the section “I. Dye-sensitized solar cell of the first embodiment”, and thus the description thereof is omitted here.

In the dye-sensitized solar cell of this embodiment, since the second electrode substrate is a transparent substrate, the first electrode substrate has transparency and transparency. It is possible to use any substrate that does not. As the first electrode substrate, for example, in the case of a transparent substrate, the first electrode substrate described in the section of “1. Dye-sensitized solar cell of the third aspect” described above, and “I The base material which consists of a transparent base material and the transparent electrode layer which were demonstrated in the term of "the dye-sensitized solar cell of 1st embodiment" etc. can be mentioned.
Moreover, when it does not have transparency, the stainless steel base material demonstrated in the term of "I. Dye-sensitized solar cell of 1st embodiment" can be mentioned.

(3) Electrolyte layer The electrolyte layer used in this embodiment can be the same as that described in the section of “I. Dye-sensitized solar cell of the first embodiment”, so the description here is Omitted.

3. Others As the dye-sensitized solar cell of the present embodiment, the dye-sensitized solar cell of the fourth embodiment among the dye-sensitized solar cell of the third embodiment and the dye-sensitized solar cell of the fourth embodiment described above. A solar cell is more preferable. This is because the dye-sensitized solar cell of the fourth aspect is more excellent in power generation efficiency.

III. Others The method for producing the dye-sensitized solar cell of the present invention is not particularly limited as long as the dye-sensitized solar cell having the above-described configuration can be formed. For example, the above oxide semiconductor The electrode substrate and the counter electrode substrate are arranged so that the porous layer and the catalyst layer face each other and sealed with a sealant, and then the liquid or gel electrolyte is placed between the oxide semiconductor electrode substrate and the counter electrode substrate. A production method for producing a dye-sensitized solar cell by forming an electrolyte layer by injection may be mentioned.
Further, for example, a solid electrolyte layer material is applied on the porous layer of the oxide semiconductor electrode substrate and dried to form a solid electrolyte layer, and then the oxide semiconductor electrode substrate and the counter electrode substrate are formed into the solid electrode. The manufacturing method which manufactures a dye-sensitized solar cell can be mentioned by arrange | positioning and contacting so that an electrolyte layer and a catalyst layer may oppose.

  In addition, all the manufacturing methods of the dye-sensitized solar cell mentioned above are examples, and it is possible to use the other general manufacturing method of a dye-sensitized solar cell in this invention.

B. Dye-sensitized solar cell module The dye-sensitized solar cell module of the present invention comprises a plurality of dye-sensitized solar cells described in the section “A. Dye-sensitized solar cell”. It is what.

  As the dye-sensitized solar cell module of the present invention, an embodiment using the above-mentioned “I. Dye-sensitized solar cell of the first embodiment” (hereinafter, the dye-sensitized solar cell module of the third embodiment and ) And an embodiment using “II. Dye-sensitized solar cell of the second embodiment” (hereinafter referred to as a dye-sensitized solar cell module of the fourth embodiment). Can be mentioned.

  A dye-sensitized solar cell module according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a schematic cross-sectional view showing an example of the dye-sensitized solar cell module according to the third embodiment of the present invention. The dye-sensitized solar cell module 20 of the present invention is formed on the first electrode substrate 11 that is a transparent substrate and the first electrode substrate 11, and the dye sensitizer is carried on the surface. Formed on the oxide semiconductor electrode substrate 1 having the porous layer 12 containing the fine metal oxide semiconductor particles, the second electrode substrate 21 having a stainless steel substrate as an electrode layer, and the second electrode substrate 21 The counter electrode substrate 2 having the catalyst layer 22 is disposed so that the porous layer 12 and the catalyst layer 22 face each other, and the electrolyte layer includes a redox pair between the oxide semiconductor electrode substrate 1 and the counter electrode substrate 2. A plurality of dye-sensitized solar cells 10 on which 3 is formed are connected in parallel. Further, the stainless steel base material includes Cr in a range of 18% to 24% by mass, Mo in a range of 0% to 4%, and N in a range of 0.3% to 1.5%. And it consists of stainless steel which does not contain Ni. Each dye-sensitized solar cell 10 is sealed with a sealant 4. In FIG. 7, the second electrode substrate 21 has a stainless steel substrate as an electrode layer, and the first electrode substrate is a transparent substrate 11b and a transparent electrode layer 11a formed on the transparent substrate 11b. Although not shown, the first electrode substrate has a stainless steel substrate as an electrode layer, and the second electrode substrate is a transparent substrate. Also good. Although not shown, as the dye-sensitized solar cell module according to the third embodiment of the present invention, a plurality of dye-sensitized solar cells may be connected in series.

  Moreover, the dye-sensitized solar cell module of the 4th embodiment in this invention is demonstrated using figures. FIG. 8 is a schematic sectional view showing an example of the dye-sensitized solar cell module according to the fourth embodiment of the present invention. The dye-sensitized solar cell module 20 of the present invention includes a transparent substrate 11b, a first electrode substrate 11 having a transparent electrode layer 11a formed on the transparent substrate 11b, and the first electrode substrate 11 being transparent. The oxide semiconductor electrode substrate 1 having the porous layer 12 containing the metal oxide semiconductor fine particles supported on the surface of the dye sensitizer formed on the electrode layer 11a, the transparent substrate 21b, and the transparent substrate 21b A second electrode base material 21 having a mesh-like stainless steel auxiliary electrode base material 21c formed on the counter electrode substrate 2 having a catalyst layer 22 formed on the second electrode base material 21, and a porous layer 12 and A plurality of dye-sensitized solar cells 10 are arranged in parallel so that the catalyst layers 22 are opposed to each other and the electrolyte layer 3 including a redox pair is formed between the oxide semiconductor electrode substrate 1 and the counter electrode substrate 2. Concatenated Is shall. The stainless steel auxiliary electrode substrate is made of the same stainless steel as the above-described stainless steel substrate. Each dye-sensitized solar cell 10 is sealed with a sealant 4. Although FIG. 8 shows a case where a dye-sensitized solar cell in which only the second electrode substrate 21 has a stainless steel auxiliary electrode substrate is used, although not shown, the dye-sensitized solar cell is not shown. As the battery, only the first electrode base material may have a stainless steel auxiliary electrode base material, or both the first electrode base material and the second electrode base material may have a stainless steel auxiliary electrode base material. There may be. Although not shown, as the dye-sensitized solar cell module according to the fourth embodiment of the present invention, a plurality of dye-sensitized solar cells may be connected in series.

  According to the present invention, even when the dye-sensitized solar cell of any of the above-described embodiments is used, the electrode layer is hardly affected by the corrosion of iodide ions in the electrolyte layer, and the deterioration with time is small. Therefore, a high-quality dye-sensitized solar cell module can be obtained.

  The dye-sensitized solar cell used in the present invention can be the same as that described in the section “A. Dye-sensitized solar cell”, and thus description thereof is omitted here.

  In the present invention, a mode in which a plurality of dye-sensitized solar cells are connected is particularly limited as long as a desired electromotive force can be obtained by the dye-sensitized solar cell module of the present invention. is not. Such an embodiment may be an embodiment in which individual dye-sensitized solar cells are connected in series, or may be connected in parallel.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the technical idea described in the claims of the present invention has substantially the same configuration and exhibits the same function and effect regardless of the case. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described more specifically with reference to examples.

[Example]
A transparent first electrode substrate was produced by forming a transparent electrode layer by sputtering FTO with a film thickness of 200 nm on a glass substrate (transparent substrate) having an area of 15 mm × 15 mm and a thickness of 4 mm. . Next, on the transparent electrode layer of the first electrode substrate described above, Ti-Nanoxide D-SP (manufactured by solarronix) was applied so as to have a 4 mm square and a film thickness of 10 μm, and baked at 500 ° C. for 1 hour. A porous layer forming layer was formed. Next, the first electrode substrate on which the layer for forming a porous layer is formed is prepared by using ruthenium complex (Nyes from Dyesol) as a sensitizing dye and acetonitrile and tert so that the concentration becomes 3 × 10 ⁻⁴ mol / l. -It was immersed in a dye-supporting coating solution dissolved in a 1: 1 solution of butyl alcohol in a volume ratio at room temperature for 20 hours so that the dye-sensitizing agent was supported on the porous layer forming layer and porous. Layered. Next, the first electrode substrate on which the porous layer is formed is pulled up from the dye-carrying coating solution, and the attached dye-carrying coating solution is washed with acetonitrile and then air-dried, thereby oxidizing the substrate. A semiconductor electrode substrate was obtained.

  0.6M hexyl metyl imidazolum iodide (Toyama Pharmaceutical), 0.03M I2 (Aldrich) and 0.1M n-metyl benzoimidazole (Aldrich) were mixed to prepare an electrolyte solution. A gel electrolyte was prepared by adding 5 wt% of 12 nm silica particles (Nippon Aerosil Co., Ltd.) to this electrolyte solution.

  As the electrode layer of the second electrode substrate, stainless steel NiFSY (Amido Metal Co., Ltd.) having an area of 15 mm × 15 mm and a film thickness of 50 μm and having the above-described composition is prepared, and 200 μm of platinum is sputtered on the second electrode substrate. Thus, a catalyst layer was formed. Thereby, a counter electrode substrate was obtained.

  The porous layer of the oxide semiconductor electrode substrate and the catalyst layer of the counter electrode substrate are arranged so as to face each other, and the electrolyte is applied on the porous layer using a screen printing method. The dye-sensitized solar cell was obtained by fixing and fusing with a thermoplastic resin film.

[Comparative example]
A dye-sensitized solar cell was produced in the same manner as in Example 1 except that stainless steel SUS304 (manufactured by Niraco) was used as the second electrode substrate.

[Evaluation]
(Performance evaluation)
Current-voltage characteristics of the dye-sensitized solar cell obtained were measured using a spectrophotometer CEP-2000 (Spectometer Co., Ltd.) using pseudo-sunlight (100 mW / cm ² , AM (AirMass) 1.5) as a light source. Thus, the photoelectric conversion efficiency was obtained. In addition, let this photoelectric conversion rate be the photoelectric conversion rate immediately after preparation of a dye-sensitized solar cell.
As a result, the dye-sensitized solar cell produced in the example had a photoelectric conversion efficiency η = 3.0%. Further, the dye-sensitized solar cell produced in the comparative example had a photoelectric conversion efficiency η = 2.7%.

(Durability evaluation)
The dye-sensitized solar cell was stored in an oven at 65 ° C. in the dark, and was taken out every 200 hours for the above-described performance evaluation. As a result of performance evaluation after 1000 hours, the performance maintenance ratio of the counter electrode substrate of the dye-sensitized solar cell produced in the example was 95%. On the other hand, the performance maintenance rate of the corresponding electrode substrate of the dye-sensitized solar cell produced in the comparative example was 50%, and it was found that the durability was greatly improved. In addition, a performance maintenance rate represents the photoelectric conversion rate after progress of 1000 hours with respect to the photoelectric conversion rate immediately after preparation of a dye-sensitized solar cell by a percentage.

DESCRIPTION OF SYMBOLS 1 ... Oxide semiconductor electrode substrate 11 ... 1st electrode base material 12 ... Porous layer 13 ... Buffer layer 2 ... Counter electrode substrate 21 ... 2nd electrode base material 22 ... Catalyst layer 3 ... Electrolyte layer 4 ... Sealing agent 10 ... Dye increase Sensitive solar cell 20 ... Dye-sensitized solar cell module

Claims (8)

A first electrode substrate having a function as an electrode, and an oxide having a porous layer including metal oxide semiconductor fine particles formed on the first electrode substrate and having a dye sensitizer supported on the surface The porous layer and the catalyst layer are opposed to a semiconductor electrode substrate, a second electrode base material having a function as an electrode, and a counter electrode substrate having a catalyst layer formed on the second electrode base material. A dye-sensitized solar cell in which an electrolyte layer including a redox pair is formed between the oxide semiconductor electrode substrate and the counter electrode substrate,
Either the first electrode base material or the second electrode base material has a mass% of Cr in the range of 18% to 24%, Mo in the range of 0% to 4%, and N of 0.3%. A dye-sensitized type comprising a stainless steel substrate made of stainless steel that is contained within a range of ˜1.5% and not containing Ni as an electrode layer, and the other is a transparent substrate. Solar cell.   The dye-sensitized dye according to claim 1, wherein the second electrode substrate has the stainless steel substrate as an electrode layer, and the first electrode substrate is a transparent substrate. Type solar cell.   The first electrode substrate has the stainless steel substrate as an electrode layer, and has a conductive buffer layer on the stainless steel substrate surface, and the second electrode substrate is transparent. The dye-sensitized solar cell according to claim 1, wherein the dye-sensitized solar cell is a base material having A first electrode substrate having a function as an electrode, and an oxide having a porous layer including metal oxide semiconductor fine particles formed on the first electrode substrate and having a dye sensitizer supported on the surface The porous layer and the catalyst layer are opposed to a semiconductor electrode substrate, a second electrode base material having a function as an electrode, and a counter electrode substrate having a catalyst layer formed on the second electrode base material. A dye-sensitized solar cell in which an electrolyte layer including a redox pair is formed between the oxide semiconductor electrode substrate and the counter electrode substrate,
At least one of the first electrode substrate or the second electrode substrate is a transparent substrate, and
From stainless steel that contains Cr in the range of 18% to 24% by mass, Mo in the range of 0% to 4%, N in the range of 0.3% to 1.5%, and no Ni A dye-sensitized solar cell comprising a mesh-like stainless steel auxiliary electrode substrate.   The dye-sensitized solar cell according to claim 4, wherein the second electrode substrate has the stainless steel auxiliary electrode substrate.   The dye-sensitized solar cell according to any one of claims 1 to 5, wherein at least a part of the stainless steel is austenitized.   A first electrode substrate having a function as an electrode, and an oxide having a porous layer including metal oxide semiconductor fine particles formed on the first electrode substrate and having a dye sensitizer supported on the surface The porous layer and the catalyst layer are opposed to a semiconductor electrode substrate, a second electrode base material having a function as an electrode, and a counter electrode substrate having a catalyst layer formed on the second electrode base material. An electrolyte layer including a redox pair is formed between the oxide semiconductor electrode substrate and the counter electrode substrate, and either the first electrode base material or the second electrode base material is From stainless steel that contains Cr in the range of 18% to 24% by mass, Mo in the range of 0% to 4%, N in the range of 0.3% to 1.5%, and no Ni Has a stainless steel substrate as an electrode layer, the other has transparency Dye-sensitized solar cell module, wherein a dye-sensitized solar cell is a substrate formed by a plurality connected.   A first electrode substrate having a function as an electrode, and an oxide having a porous layer including metal oxide semiconductor fine particles formed on the first electrode substrate and having a dye sensitizer supported on the surface The porous layer and the catalyst layer are opposed to a semiconductor electrode substrate, a second electrode base material having a function as an electrode, and a counter electrode substrate having a catalyst layer formed on the second electrode base material. An electrolyte layer including a redox pair is formed between the oxide semiconductor electrode substrate and the counter electrode substrate, and at least one of the first electrode base material or the second electrode base material is transparent And containing, by mass%, Cr in the range of 18% to 24%, Mo in the range of 0% to 4%, and N in the range of 0.3% to 1.5%. And stainless steel made of stainless steel that does not contain Ni A dye-sensitized solar cell module, wherein a plurality of dye-sensitized solar cells having an auxiliary electrode substrate are connected.

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