TWM462446U - Electrode structure and solar cell using the same - Google Patents
Electrode structure and solar cell using the same Download PDFInfo
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- TWM462446U TWM462446U TW102207488U TW102207488U TWM462446U TW M462446 U TWM462446 U TW M462446U TW 102207488 U TW102207488 U TW 102207488U TW 102207488 U TW102207488 U TW 102207488U TW M462446 U TWM462446 U TW M462446U
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- 239000000758 substrate Substances 0.000 claims abstract description 30
- 239000004065 semiconductor Substances 0.000 claims description 18
- 238000007650 screen-printing Methods 0.000 description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 239000004020 conductor Substances 0.000 description 7
- 239000007772 electrode material Substances 0.000 description 7
- 238000007639 printing Methods 0.000 description 7
- 229910052709 silver Inorganic materials 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical group [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Photovoltaic Devices (AREA)
Abstract
Description
本創作係有關於一種電極結構，尤指一種可適用於太陽能電池之電極結構。This creation relates to an electrode structure, and more particularly to an electrode structure that can be applied to a solar cell.
能源枯竭日益嚴重，加上各國環保意識抬頭，莫不重視再生能源的開發，特別是太陽光沒有能源耗盡的問題，因此，太陽能電池受到極大的關注，在追求光電轉換效率的同時，降低成本也成為研發之重要目標。Energy depletion is becoming more and more serious, and the environmental awareness of various countries is rising. We do not pay much attention to the development of renewable energy, especially the problem that solar energy has no energy exhaustion. Therefore, solar cells have received great attention, and in pursuit of photoelectric conversion efficiency, the cost is also reduced. Become an important goal of research and development.
請參見圖1，圖1係習知太陽能電池之剖面圖，習知的太陽能電池100包含半導體基板10，半導體基板10中具有P-N接合區15，當光照射至基板10之正面10a時，半導體元素例如矽原子之電子和電洞會彼此分離，於P-N接合區15形成內部電場而產生漂移電流。為將太陽光能轉換成的電流導通，需於半導體基板10正面10a，配置電極主柵線12與電極副柵線11作為陽極電極，以及於基板10背面10b配置陰極電極14。其中，正面10a上方會密集分布副柵線11，因此又稱為指狀(finger)電極，而主柵線12作為匯流排(bus bar)，將副柵線11之電流匯集導通。不過，分布密集的副柵線11所在區域會導致太陽能電池100的遮光率上升，因此副柵線11線寬越細越能降低遮光率，而主柵線12為匯集電流，其線寬大於副柵線11之線寬。Referring to FIG. 1, FIG. 1 is a cross-sectional view of a conventional solar cell 100. The conventional solar cell 100 includes a semiconductor substrate 10 having a PN junction region 15 therein. When light is irradiated to the front surface 10a of the substrate 10, the semiconductor element For example, electrons and holes of the germanium atom are separated from each other, and an internal electric field is formed in the PN junction region 15 to generate a drift current. In order to conduct the current into which the solar light energy is converted, the electrode main gate line 12 and the electrode sub-gate line 11 are disposed as anode electrodes on the front surface 10a of the semiconductor substrate 10, and the cathode electrode 14 is disposed on the back surface 10b of the substrate 10. The sub-gate line 11 is densely distributed above the front surface 10a, and is therefore also referred to as a finger electrode, and the main gate line 12 serves as a bus bar for conducting currents of the sub-gate line 11. However, the area where the densely distributed sub-gate lines 11 are located causes the light-shielding rate of the solar cell 100 to rise. Therefore, the finer the line width of the sub-gate line 11 is, the more the light-shielding rate can be lowered, and the main gate line 12 is a collecting current whose line width is larger than that of the sub-gate. Line 11 is wide.
習知技術利用網版印刷技術將電極材料依照設計的印刷圖案印刷到基板10正面10a，並利用高溫燒結，使電極材料與半導體基板10之間形成良好的歐姆接觸。由於金屬具有良好的導電性，因此廣泛運用為太陽能電池的電極材料，特別是銀，通常銀的含量為電極材料90%。不過，若線寬大的主柵線12與細的副柵線11皆由相同比例的銀含量組成，成本太高，因此，目前技術已從一次印刷演進到二次印刷，副柵線11的銀含量不變，而主柵線12的銀含量可降低至60%，將不同銀含量的電極材料分別透過第一次網印程序S1與第二次網印程序S2印刷至基板10正面10a上方(如圖2所示)，據此可大幅降低成本。The prior art uses a screen printing technique to print an electrode material to the front surface 10a of the substrate 10 in accordance with a designed printing pattern, and uses high temperature sintering to form a good ohmic contact between the electrode material and the semiconductor substrate 10. Since metal has good electrical conductivity, it is widely used as an electrode material of a solar cell, particularly silver, and the content of silver is usually 90% of the electrode material. However, if the main gate line 12 and the thin sub-gate line 11 having a large line width are composed of the same proportion of silver content, the cost is too high. Therefore, the current technology has evolved from one printing to the second printing, and the silver of the sub-gate line 11 The content is constant, and the silver content of the main grid line 12 can be reduced to 60%, and the electrode materials of different silver contents are printed onto the front surface 10a of the substrate 10 through the first screen printing process S1 and the second screen printing process S2, respectively. As shown in Figure 2, the cost can be greatly reduced accordingly.
然而，申請人發現印刷所使用的網版大約印刷五千次後會逐漸變形，因此在進行二次印刷時，極可能如圖3所示，邊緣的副柵線11與主柵線12的接合處發生異常，如虛線B1所示，主柵線12凸出於邊緣的副柵線11，而虛線B2所示之主柵線12則未與邊緣的副柵線11相接合，不僅無法將邊緣副柵線11的電流導通，接合處未對齊的問題亦破壞美觀，因此，只能換新的網版來改善問題，但卻耗費成本。另外，若是網印的對位偏移，也會導致前述接合處發生異常。有鑑於此，該如何在降低成本的情況下，有效解決太陽能電池正面電極接合異常之外觀，為本案發展之目的。However, the Applicant has found that the screen used for printing is gradually deformed after about 5,000 printings, so when performing secondary printing, it is highly likely that the joint of the sub-gate line 11 of the edge and the main gate line 12 is as shown in FIG. An abnormality occurs, as indicated by a broken line B1, the main gate line 12 protrudes from the edge of the sub-gate line 11, and the main gate line 12 shown by the broken line B2 is not bonded to the sub-gate line 11 of the edge, not only the edge pair The current of the gate line 11 is turned on, and the problem of misalignment of the joint is also detrimental to the aesthetics. Therefore, only a new screen can be replaced to improve the problem, but it is costly. In addition, if the offset of the screen printing is offset, an abnormality may occur in the joint. In view of this, how to effectively solve the appearance of the abnormal electrode bonding of the front side of the solar cell under the condition of reducing the cost is the development of the present invention.
本創作之一目的在於提供一種太陽能電池，能節省製成成本及有效解決太陽能電池正面電極接合異常之外觀。為達前述目的，本創作之一實施例之太陽能電池包括半導體基板，具有第一面及與第一面相對之第二面，其中，第一面具有沿第一方向延伸之側邊區；複數個第一電極，配置於第一面上方，與半導體基板電性相接，該些第一電極依第二方向平行間隔排列，其中部份該些第一電極位於側邊區中，且第一方向與第二方向相交；第二電極，依第二方向延伸於第一面上方， 與該些第一電極電性相接，且第二電極之頂端位於側邊區中任兩個第一電極之間；以及第三電極，依第三方向延伸於第一面上方，並連接第二電極之頂端與側邊區中離第二電極之頂端最遠的第一電極，其中，第三方向與第一方向相交，且第二電極的寬度大於第一電極的寬度。One of the aims of the present invention is to provide a solar cell which can save the manufacturing cost and effectively solve the appearance of abnormality of the front electrode of the solar cell. To achieve the foregoing objective, a solar cell according to an embodiment of the present invention includes a semiconductor substrate having a first surface and a second surface opposite to the first surface, wherein the first surface has a side region extending along the first direction; The first electrodes are disposed above the first surface and electrically connected to the semiconductor substrate. The first electrodes are arranged in parallel along the second direction, wherein some of the first electrodes are located in the side regions, and the first The direction intersects with the second direction; the second electrode extends above the first surface in the second direction, Electrically contacting the first electrodes, and the top end of the second electrode is located between any two first electrodes in the side region; and the third electrode extends above the first surface in the third direction and is connected a first electrode of the second electrode and a first electrode of the side region farthest from the top end of the second electrode, wherein the third direction intersects the first direction, and the width of the second electrode is greater than the width of the first electrode.
本創作之一實施例之太陽能電池，上述之第三電極的寬度大於該些第一電極的寬度。In a solar cell according to an embodiment of the present invention, the width of the third electrode is larger than the width of the first electrodes.
本創作之一實施例之太陽能電池，上述之第二電極的寬度大於第三電極的寬度。In a solar cell according to an embodiment of the present invention, the width of the second electrode is greater than the width of the third electrode.
本創作之一實施例之太陽能電池，上述之半導體基板包含，抗反射層，配置於第一面；P-N接合區，配置於第一面與第二面之間；以及第四電極，配置於第二面，與半導體基板電性相接。In a solar cell according to an embodiment of the present invention, the semiconductor substrate includes: an anti-reflection layer disposed on the first surface; a PN junction region disposed between the first surface and the second surface; and a fourth electrode disposed on the first surface On both sides, it is electrically connected to the semiconductor substrate.
本創作之一實施例之太陽能電池，上述之第一方向與第二方向實質上呈垂直。In a solar cell according to an embodiment of the present invention, the first direction and the second direction are substantially perpendicular.
本創作之一實施例之太陽能電池，上述之第三方向與第二方向實質上呈平行。In a solar cell according to an embodiment of the present invention, the third direction and the second direction are substantially parallel.
本創作之一實施例之太陽能電池，更包括另一第三電極，依第四方向延伸於第一面上方，並連接第二電極之頂端與側邊區中離第二電極之頂端最遠的第一電極，其中，第四方向與第一方向相交。The solar cell of one embodiment of the present invention further includes another third electrode extending above the first surface in the fourth direction and connecting the top end of the second electrode to the farthest side of the side electrode from the top end of the second electrode a first electrode, wherein the fourth direction intersects the first direction.
本創作之一實施例之太陽能電池，上述之第四方向與第二方向或第三方向實質上呈平行。In a solar cell according to an embodiment of the present invention, the fourth direction is substantially parallel to the second direction or the third direction.
本創作之一實施例之太陽能電池，上述之三個或四個該些第一電極位於側邊區中。In a solar cell according to an embodiment of the present invention, the three or four of the first electrodes are located in the side regions.
本創作之一目的在於提供一種電極結構，能節省製成成本及有效解決太陽能電池正面電極接合異常之外觀。為達前述目的，其電極結構適用於太陽能電池，太陽能電池具有基板，電極結構配置於基 板之受光面上方，受光面具有沿第一方向延伸之側邊區，電極結構包括複數個第一電極，依第二方向平行間隔排列，其中，部分該些第一電極位於側邊區中，且第一方向與第二方向相交；第二電極，依第二方向延伸，與該些第一電極電性相接，且第二電極之頂端位於側邊區中任兩個第一電極之間；以及至少一第三電極，依第三方向延伸，連接第二電極之頂端與側邊區中離第二電極之頂端最遠的第一電極，其中，第三方向與第一方向相交，且第二電極的寬度大於第三電極的寬度，且第三電極的寬度大於該些第一電極的寬度。One of the aims of the present invention is to provide an electrode structure which can save the manufacturing cost and effectively solve the appearance of abnormality of the front electrode of the solar cell. In order to achieve the above purpose, the electrode structure is suitable for a solar cell, the solar cell has a substrate, and the electrode structure is disposed on the base. Above the light receiving surface of the board, the light receiving surface has a side area extending along the first direction, and the electrode structure comprises a plurality of first electrodes arranged in parallel according to the second direction, wherein some of the first electrodes are located in the side area, And the first direction intersects with the second direction; the second electrode extends in the second direction and is electrically connected to the first electrodes, and the top end of the second electrode is located between any two first electrodes in the side region And at least one third electrode extending in a third direction, connecting the top end of the second electrode and the first electrode in the side region farthest from the top end of the second electrode, wherein the third direction intersects the first direction, and The width of the second electrode is greater than the width of the third electrode, and the width of the third electrode is greater than the width of the first electrodes.
10‧‧‧半導體基板10‧‧‧Semiconductor substrate
10a‧‧‧半導體基板正面10a‧‧‧Semiconductor substrate front
10b‧‧‧半導體基板背面10b‧‧‧Back of semiconductor substrate
100、200‧‧‧太陽能電池100, 200‧‧‧ solar cells
11、21‧‧‧電極副柵線11, 21‧‧‧electrode sub-gate line
12、22‧‧‧電極主柵線12, 22‧‧‧electrode main grid line
14‧‧‧陰極電極14‧‧‧Cathode electrode
15‧‧‧P-N接合區15‧‧‧P-N junction area
16‧‧‧抗反射層16‧‧‧Anti-reflective layer
31‧‧‧第一電極31‧‧‧First electrode
32‧‧‧第二電極32‧‧‧second electrode
33、33a‧‧‧第三電極33, 33a‧‧‧ third electrode
A1‧‧‧側邊區A1‧‧‧Side area
B1、B2、C1、C2、D1、D2‧‧‧接合處B1, B2, C1, C2, D1, D2‧‧‧ joints
S1、S2‧‧‧網印程序S1, S2‧‧‧ screen printing program
X1、X2、X3、X4‧‧‧方向X1, X2, X3, X4‧‧‧ directions
圖1係習知太陽能電池之剖面圖。Figure 1 is a cross-sectional view of a conventional solar cell.
圖2係習知太陽能電池之正面電極結構分解上視圖。2 is an exploded top view of a front electrode structure of a conventional solar cell.
圖3係習知太陽能電池之正面電極結構上視圖。3 is a top view of a front electrode structure of a conventional solar cell.
圖4係本創作之第一實施例中太陽能電池之正面電極結構分解上視圖。Fig. 4 is an exploded top plan view showing the front electrode structure of the solar cell in the first embodiment of the present invention.
圖5係本創作之第一實施例中太陽能電池之正面電極結構上視圖。Figure 5 is a top plan view of the front electrode structure of the solar cell in the first embodiment of the present invention.
圖6係本創作之第二實施例中太陽能電池之正面電極結構分解上視圖。Fig. 6 is an exploded top plan view showing the front electrode structure of the solar cell in the second embodiment of the present invention.
圖7係本創作之第二實施例中太陽能電池之正面電極結構上視圖。Figure 7 is a top plan view of the front electrode structure of the solar cell in the second embodiment of the present invention.
圖8係本創作之第三實施例中太陽能電池之正面電極結構上視圖。Figure 8 is a top plan view of the front electrode structure of the solar cell in the third embodiment of the present invention.
圖9係本創作之第二實施例之太陽能電池剖面圖。Figure 9 is a cross-sectional view of a solar cell of a second embodiment of the present invention.
請參閱圖4，圖4係本創作之第一實施例中太陽能電池之正面電極結構分解上視圖。本實施例中，申請人將主柵線22的頂端設計為細 長尖端，使其與邊緣副柵線21接合時，即便對位不準或網版變形而導致接合處C1及C2之不平整，就肉眼觀之，與習知的B1及B2之不平整相比，變得比較不明顯(如圖5所示)。Please refer to FIG. 4. FIG. 4 is an exploded top view of the front electrode structure of the solar cell in the first embodiment of the present invention. In this embodiment, the applicant designs the top end of the main grid line 22 to be thin. When the long tip is joined to the edge sub-grid line 21, even if the alignment is not correct or the screen is deformed, the joints C1 and C2 are uneven, and the naked eye is observed with the conventional B1 and B2. Compared, it becomes less obvious (as shown in Figure 5).
另外，申請人提供本創作之第二實施例，請參閱圖6，圖6係本創作第二實施例中太陽能電池之正面電極結構分解上視圖。於本實施例中，半導體基板10之正面10a，即受光面，具有沿第一方向X1延伸的側邊區A1。進行第一網印程序S1，將第一導電材料透過第一網版圖案(圖未示)印刷至基板10正面10a上方，用以形成複數個第一電極31以及第三電極33，其中，每個第一電極31皆沿第一方向X1延伸，且該些第一電極31依第二方向X2平行間隔排列，該些第一電極31之間隔距離可介於1300微米至2500微米之間，其中，側邊區A1中具有部分的第一電極31，例如三個或四個第一電極31排列於側邊區A1中。值得注意的是，第三電極33一端連接側邊區A1中最邊緣的第一電極31，另一端依第三方向X3延伸至側邊區A1中任意兩個第一電極31之間，其中，第一方向X1與第三方向X3相交，可為實質上垂直交叉，因此，第三電極33與側邊區A1中有延伸經過的部分第一電極31直接接觸相交。In addition, the applicant provides a second embodiment of the present invention. Please refer to FIG. 6. FIG. 6 is an exploded top view of the front electrode structure of the solar cell in the second embodiment of the present invention. In the present embodiment, the front surface 10a of the semiconductor substrate 10, that is, the light receiving surface, has a side area A1 extending in the first direction X1. The first screen printing process S1 is performed, and the first conductive material is printed on the front surface 10a of the substrate 10 through the first screen pattern (not shown) to form a plurality of first electrodes 31 and third electrodes 33, wherein each The first electrodes 31 are all arranged along the first direction X1, and the first electrodes 31 are arranged in parallel along the second direction X2. The distance between the first electrodes 31 may be between 1300 micrometers and 2500 micrometers. A part of the first electrode 31 in the side area A1, for example, three or four first electrodes 31 are arranged in the side area A1. It is to be noted that the third electrode 33 is connected to the first electrode 31 of the edge of the side edge area A1 at one end, and the other end of the third electrode 33 is connected to any two of the first electrodes 31 of the side area A1. The first direction X1 intersects with the third direction X3, and may be substantially perpendicularly intersected. Therefore, the third electrode 33 is in direct contact with a portion of the first electrode 31 extending through the side area A1.
接下來，進行第二網印程序S2，將第二導電材料透過第二網版圖案(圖未示)印刷至基板10正面10a，用以形成依第二方向X2延伸的第二電極32，而第二電極32頂端於側邊區A1中任意兩個第一電極31之間與第三電極33相接合，而第二方向X2與第一方向X1相交，可為質實上垂直交叉。第二電極32與半導體基板10電性相接，並透過第三電極33與側邊區A1中的部分第一電極31電性相接，據以匯流側邊區A1中的部分第一電極31之電流，而第二電極32直接與其他第一電極31直接接觸。值得注意的是，第一網印程序S1與第二網印程序S2之間先後順序關係可置換，例如，先進行第二網印程序S2後，再進行第一網印程序S1。另外，可利用對準標誌以協助第二電極32與第三電極33之接合。Next, the second screen printing process S2 is performed, and the second conductive material is printed to the front surface 10a of the substrate 10 through the second screen pattern (not shown) for forming the second electrode 32 extending in the second direction X2. The top end of the second electrode 32 is joined to the third electrode 33 between any two of the first electrodes 31 in the side area A1, and the second direction X2 intersects with the first direction X1, which may be vertically intersected in a solid state. The second electrode 32 is electrically connected to the semiconductor substrate 10 and electrically connected to a portion of the first electrode 31 in the side edge region A1 through the third electrode 33, thereby collecting a portion of the first electrode 31 in the side edge region A1. The current is while the second electrode 32 is in direct contact with the other first electrodes 31. It should be noted that the sequential relationship between the first screen printing program S1 and the second screen printing program S2 may be replaced. For example, after the second screen printing program S2 is performed, the first screen printing program S1 is performed. Additionally, alignment marks can be utilized to assist in the bonding of the second electrode 32 to the third electrode 33.
其中，第一導電材料可為包含90%金屬含量的電極材料，據以網印形成之第一電極31可為太陽能電池之正面電極結構中的副柵線，第二導電材料可為包含60%金屬含量的電極材料，據以網印形成之第二電極32可為正面電極結構中的主柵線，而由第一導電材料網印形成之第三電極33可連接主柵線與副柵線未直接接觸的區域，其可作為側邊區A1的匯流排。其中，第一導電材料及第二導電材料所使用的金屬可為銀或銅。另外，第二電極32的寬度可大於第一電極31的寬度，例如前者寬度可為1500微米，後者寬度可為50微米；而第三電極33寬度可介於第一電極31與第二電極32的寬度之間，例如300微米至500微米。據此，完成本創作第二實施例之太陽能電池200(如圖9所示)。不過，第一電極31、第二電極32與第三電極33之寬度大小關係，不受前述限制，只要能達到有效導通電流之效果即可。The first conductive material may be an electrode material containing a metal content of 90%. The first electrode 31 formed by screen printing may be a sub-gate line in the front electrode structure of the solar cell, and the second conductive material may be 60%. The metal content electrode material, the second electrode 32 formed by screen printing may be a main gate line in the front electrode structure, and the third electrode 33 formed by the first conductive material screen printing may be connected to the main gate line and the sub-gate line An area that is not in direct contact, which serves as a busbar for the side area A1. The metal used for the first conductive material and the second conductive material may be silver or copper. In addition, the width of the second electrode 32 may be greater than the width of the first electrode 31. For example, the width of the former may be 1500 micrometers, and the width of the latter may be 50 micrometers; and the width of the third electrode 33 may be between the first electrode 31 and the second electrode 32. Between the widths, for example 300 microns to 500 microns. Accordingly, the solar cell 200 of the second embodiment of the present invention is completed (as shown in FIG. 9). However, the relationship between the width of the first electrode 31, the second electrode 32, and the third electrode 33 is not limited to the above, as long as the effect of the effective on current can be achieved.
值得注意的是，於本實施例中，第二方向X2與第三方向X3可為實質上平行(如圖6所示)，第三電極33之一端依第三方向X3延伸至側邊區A1中任意兩個第一電極31的間隔中，據此，即使網版變形或對位偏移，而造成第二電極32與第三電極33對準時在合理的範圍內上下左右偏移，如圖7中虛線D1與D2所示，但第二電極32與第三電極33的接合處仍能位於側邊區A1中該兩個第一電極31之間，據此，不會導致第二電極32在最邊緣第一電極31上有所凸出或凹陷，而且肉眼也難以辨識出D1與D2之接合處在第一電極31的間隔中有所不齊，再者，亦可增加網版使用次數，例如超過1萬至2萬次，其變形所導致的對準偏移才可能超過合理範圍。據此，本創作第二實施例不僅可有效解決習知二次印刷所造成太陽能電池正面電極結構的外觀缺陷之問題，亦可避免耗費過多網版的成本。另外，第三方向X3亦與第二方向X2可些微交叉，只要讓第二電極32與第三電極33對準時在合理範圍內上下左右偏移，仍能相接合即可。It should be noted that in this embodiment, the second direction X2 and the third direction X3 may be substantially parallel (as shown in FIG. 6), and one end of the third electrode 33 extends to the side area A1 according to the third direction X3. In the interval between any two of the first electrodes 31, according to this, even if the screen is deformed or the alignment is offset, the second electrode 32 and the third electrode 33 are aligned, and the upper and lower sides are offset within a reasonable range, as shown in the figure. 7 is shown by the broken lines D1 and D2, but the junction of the second electrode 32 and the third electrode 33 can still be located between the two first electrodes 31 in the side area A1, according to which the second electrode 32 is not caused. There is a convex or concave surface on the most edge first electrode 31, and it is difficult for the naked eye to recognize that the joint of D1 and D2 is not uniform in the interval of the first electrode 31, and the number of times of use of the screen can be increased. For example, more than 10,000 to 20,000 times, the alignment offset caused by the deformation may exceed a reasonable range. Accordingly, the second embodiment of the present invention can not only effectively solve the problem of appearance defects of the front electrode structure of the solar cell caused by the conventional secondary printing, but also avoid the cost of consuming too much screen. In addition, the third direction X3 may also slightly intersect with the second direction X2. As long as the second electrode 32 is aligned with the third electrode 33, it may be vertically and horizontally offset within a reasonable range, and may be joined.
請參閱圖8，圖8係本創作之第三實施例之太陽能電池之正 面電極結構上視圖。太陽能電池200可包括兩個或多個第三電極，如具有第三電極33及33a同時連接第二電極32與側邊區A1中最邊緣的第一電極31，且第三電極33a可依第四方向X4延伸於基板10正面10a上方，其中，第四方向X4與第一方向X1相交，而第四方向X4可與第二方向X2或第三方向X3實質上平行，亦可與第二方向X2或第三方向X3些微交叉，只要讓第二電極32與第三電極33對準時在合理範圍內上下左右偏移，仍能相接合即可。據此，同樣能在節省製程成本的情況下，達到有效解決習知太陽能電池正面電極結構的外觀缺陷之效果。Please refer to FIG. 8. FIG. 8 is a positive view of a solar cell according to a third embodiment of the present invention. Top view of the surface electrode structure. The solar cell 200 may include two or more third electrodes, such as the first electrode 31 having the third electrodes 33 and 33a simultaneously connecting the second electrode 32 and the edge of the side edge area A1, and the third electrode 33a may be The four directions X4 extend above the front surface 10a of the substrate 10, wherein the fourth direction X4 intersects the first direction X1, and the fourth direction X4 may be substantially parallel with the second direction X2 or the third direction X3, or may be opposite to the second direction The X2 or the third direction X3 slightly intersects, and if the second electrode 32 and the third electrode 33 are aligned, they are shifted up, down, left, and right within a reasonable range, and can be joined. According to this, it is also possible to effectively solve the appearance defect of the front electrode structure of the conventional solar cell while saving the process cost.
請參閱圖9，太陽能電池200之半導體基板10可包括抗反射層16，配置於基板10的正面10a，減少太陽光反射出去，藉此提高太陽能電池的吸光率。Referring to FIG. 9, the semiconductor substrate 10 of the solar cell 200 may include an anti-reflection layer 16 disposed on the front surface 10a of the substrate 10 to reduce reflection of sunlight, thereby increasing the light absorption rate of the solar cell.
31‧‧‧第一電極31‧‧‧First electrode
32‧‧‧第二電極32‧‧‧second electrode
33‧‧‧第三電極33‧‧‧ third electrode
A1‧‧‧側邊區A1‧‧‧Side area
S1、S2‧‧‧網印程序S1, S2‧‧‧ screen printing program
X1、X2、X3‧‧‧方向X1, X2, X3‧‧‧ directions
Claims (11)
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| Application Number | Priority Date | Filing Date | Title |
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| TW102207488U TWM462446U (en) | 2013-04-24 | 2013-04-24 | Electrode structure and solar cell using the same |
| CN201320895516.8U CN203895469U (en) | 2013-04-24 | 2013-12-30 | Electrode structure and solar cell applicable to same |
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| CN113442566B (en) * | 2020-03-26 | 2024-08-27 | 仓和精密制造(苏州)有限公司 | Secondary printing screen structure and method for printing solar cells |
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