Method for manufacturing self aligned electrode on surface of thin-film type solar battery
A technology of solar cells and manufacturing methods, applied in the direction of final product manufacturing, sustainable manufacturing/processing, circuits, etc., can solve the problems that the electrical conductivity of the battery cannot be improved, and the screen printing is difficult to align with the slot P2, etc., so as to facilitate popularization Application, low production cost, and good electrical conductivity
Active Publication Date: 2012-09-19
珠海中科先进科技产业有限公司
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Problems solved by technology
The traditional method of depositing metal at the bottom of slot P2 mainly uses screen printing silver paste, but screen printing has the problem that it is difficult to align slot P2. When the alignment is not correct, not only the conductivity of the battery will not be improved, but it will increase. The efficiency of solar cells is affected by the influence of the shading area
Method used
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Embodiment 1
[0046] Vacuum-deposit a Mo back electrode layer with a thickness of 1 μm on the glass substrate, and open the first groove on the Mo back electrode layer by laser scribing;
[0047] On the Mo back electrode layer and the bottom of the first groove, a CIGS thin film layer with a thickness of 2-2.5 μm is sequentially formed as a light absorption layer, a CdS layer with a thickness of 80 nm as a buffer layer, and an intrinsic ZnO high resistance layer with a thickness of 60 nm as a high resistance layer;
[0048] Opening a second groove through mechanical scribing on the light absorbing layer, the buffer layer and the high resistance layer;
[0049] The prepared structure is placed in the electroplating tank, and the mixed solution of copper pyrophosphate, potassium pyrophosphate of 300g / L and potassium nitrate of 5g / L is used as the electrolyte with a concentration of 52g / L, and the temperature of the mixed solution is controlled at 40 °C, pH between 8.0 and 8.7, the anode is c...
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The invention relates to a method for manufacturing a self aligned electrode on a surface of a thin-film type solar battery. The method is characterized by comprising the following steps: manufacturing a metal back electrode layer, a light absorption layer, a buffer layer, a high resistance layer and an electric conduction window layer on a substrate sequentially and arranging grooves at corresponding positions, thus obtaining a solar battery assembly in series connection; and adopting an electroplating technology to electroplate a metal layer for reducing the depth width ratio of a second groove at the bottom of the second groove, thus improving the uniformity of a transparent electrode layer and reducing the electron loss in transport. The bottom of the second groove is the metal back electrode layer, and the electroplating technology is adopted, so that the metal layer can be manufactured on the metal back electrode layer at the bottom of the groove directly, thereby avoiding the efficiency of the solar battery being influenced by the factor that metal layers are formed at a window layer and other positions.
Description
【Technical field】 [0001] The invention relates to the field of photovoltaic cell manufacturing, in particular to a method for manufacturing a surface self-alignment electrode of a thin-film solar cell. 【Background technique】 [0002] The compound semiconductor copper indium gallium selenide (Cu(In,Ga)Se) with chalcopyrite structure 2 , referred to as CIGS) film as a light-absorbing layer of thin-film solar cells not only has a high energy conversion efficiency, but also has radiation stability, and thus become one of the research hotspots in the field of photovoltaic cells. [0003] The existing CIGS thin film solar cell structure includes sequentially stacked substrate / back electrode layer / light absorbing layer / buffer layer / window layer / transparent electrode layer, etc., and by making grooves on the film, such as opening grooves on the back electrode layer P1, slot P2 is opened on the light absorbing layer, buffer layer and high resistance layer, slot P3 is opened on the l...
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IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 李玉飞肖旭东杨春雷宋秋明
Owner 珠海中科先进科技产业有限公司