JPS63143878A - Silicon solar cell - Google Patents

Abstract

PURPOSE:To make it possible to differentiate the external color of a specified part from the external color of another part, by differentiating the thickness of the specified part of a transparent conductive film from the thickness of another part. CONSTITUTION:For a transparent conductor film 2, a metal mask 3a is used, and an ITO film is formed to a thickness of 700Angstrom by an electron beam evaporating method. A metal mask 3b has character patterns of ABC of alphabet. A specified part 2a is formed by suing the metal mask 3b on the transparent conductor film 2. An ITO film is further deposited to a thickness of 200Angstrom by the electron beam evaprating method. Therefore, the thickness of the part of the transparent conductor film 2a becomes 900Angstrom . The thickness of a transparent conductor film 2b is 700Angstrom . The transparent conductor films 2a and 2b have different spectroscopic reflectances. The transparent conductor film 2a looks blue, and 2b looks brown. Therefore, the characters ABC of alphabet formed on the transparent conductor film 2a can be clearly displayed as the difference in colors on the surface of an amorphous solar battery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a silicon solar cell having a transparent conductive film.

Prior Art A conventional silicon solar cell of this type had a structure as shown in FIG.

That is, 10 in FIG. 6 is a glass substrate, and a transparent conductive film 11 having a uniform thickness was provided over the entire surface of the glass substrate 1o. A silicon layer 12 is provided on the transparent conductive film 11, and a metal electrode film 13 is further provided on the silicon layer 12, with the silicon layer 12 sandwiched between the transparent conductive film 11 and the metal electrode film 13. It was.

Problems to be Solved by the Invention However, in such a conventional configuration, the transparent conductive film 11 is made to have a uniform thickness over the entire surface, so the external appearance of the silicon solar cell is a single color, and the characters are different from each other. There was a problem that it was difficult to display images, designs, etc.

The present invention solves these problems and aims to provide a silicon solar cell whose external color can be partially varied.

Means to Solve the Problems In order to solve these conventional problems, the silicon solar cell of the present invention has a transparent conductive film in which the thickness of a specific part is different from that of other parts. It is.

Effect With the above structure, the difference in the film thickness of the transparent conductive film becomes the difference in the spectral reflectance of the transparent conductive film with respect to incident light, so that the external appearance color of a specific part can be made different from the external appearance color of other parts.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, reference numeral 1 denotes a glass substrate, on which a transparent conductive film 2 of an electrode made of indium tin oxide (hereinafter abbreviated as ITO) is provided. This transparent conductive film 2 is formed by forming an ITO film to a thickness of 700 mm by electron beam evaporation using a metal mask 31L having the pattern shown in FIG. 3 (IL). Alphabet 5 BC forming the specific portion 2m of the transparent conductive film 2 shown
Using a metal mask 3b with a letter pattern, 200 τ0 films were deposited by electron beam evaporation. Therefore, the thickness of the transparent conductive film 2& is 900, and the thickness of the transparent conductive film 2b is 700.

On this transparent conductive film 2, an amorphous silicon layer 4 is provided by a plasma CVD method. It is formed from three layers of mold. Then, using an electron beam evaporation method on the amorphous silicon layer 4, soo.

A metal electrode film 6 made of aluminum with a human thickness is provided, and an amorphous silicon layer 4 is sandwiched between the transparent conductive film 2 and the metal electrode film 5. FIG. 4 shows the spectral reflectance of the transparent conductive films 2& and 2b of the amorphous solar cell of this example thus produced. As is clear from FIG. 4, the transparent conductive films 2a and 2b have different spectral reflectances, with the transparent conductive film 2a appearing blue and the transparent conductive film 2b appearing brown. Therefore, the letters 5 BC formed from the transparent conductive film 2& can be clearly displayed on the surface of the amorphous solar cell as different colors.

Although this example describes an amorphous silicon solar cell with a glass/ITO/amorphous silicon/aluminum structure using a glass substrate as a substrate, an amorphous silicon solar cell using an opaque substrate such as a polyimide film or ceramic as a substrate may also be used. For batteries, the same effects as in this example can be obtained by changing the thickness of the transparent conductive film according to a desired pattern.

Effects of the Invention As is clear from the above description of the embodiments, the present invention has the advantage of making the thickness of a specific portion of the transparent conductive film different from that of other portions, thereby changing the appearance color of the specific portion and other characteristics. Since the external appearance color of the parts can be made different, it is possible to obtain an excellent silicon solar cell that can clearly display characters, designs, etc.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a transparent conductive film of a silicon solar cell according to an embodiment of the present invention, Fig. 2 is a front view showing the same silicon solar cell, and Fig. 3 (IL) (b) is a perspective view showing the same silicon solar cell. FIG. 4 is a diagram showing the spectral reflectance of the silicon solar cell, and FIG. 6 is a front view of a conventional silicon solar cell. 2...Transparent conductive film, 2&...Specific portion, 2b...Other WIs portion, 4...Amorphous silicon layer, 6...・Metal electrode film. Name of agent: Patent attorney Sano Nakao and 1 other person 2nd
Figure 3 H2 Cb) Figure 4 ψθ SOθ 6L00
700 liquid length (Nine hats Figure 5)

Claims (1)

[Claims] The photoelectric conversion layer includes a silicon layer and a plurality of electrode films sandwiching the silicon layer, at least one of the plurality of electrode films is formed of a transparent conductive film, and a specific portion of the transparent conductive film is A silicon solar cell whose film thickness is different from that of other parts.