Back electrode structure and preparation method of back contact silicon solar cell
A silicon solar cell and back electrode technology, applied in the field of solar cells, can solve the problems of reducing the gain, reducing the area of the back electric field, offsetting, etc., so as to achieve the effect of improving the battery efficiency, facilitating welding, and avoiding welding problems.
Active Publication Date: 2015-08-26
CSI CELLS CO LTD +1
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Problems solved by technology
However, the area of the hole metal electrode and the back electrode must be increased to facilitate subsequent component manufacturing and welding, which will inevitably reduce the area of the back electric field, thereby reducing or offsetting the gain brought about by the shape change of the back electrode
Method used
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Embodiment 1
[0050] see Figure 1~8 Shown, a kind of preparation method of the back electrode structure of back contact silicon solar cell, comprises the steps:
[0051] (1) The silicon wafer 1 is textured, diffused, punched, etched, coated, and then printed with a back electric field;
[0052] Wherein, at least two through holes 2 are formed on the silicon wafer after drilling, and the through holes are arranged side by side to form at least one through hole row; see figure 1 , 2 shown;
[0053] When printing the back electric field, the hole metal electrode opening 4 and the back electrode opening 5 are reserved in the back electric field 3, and the hole metal electrode opening corresponds to the through hole one by one; see image 3 , 4 shown;
[0054] (2) Print a strip-shaped insulating adhesive film layer 6 on the back electric field surface of the area where each said through-hole column is located, and the number of insulating adhesive film layers is the same as the column numb...
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The invention discloses a manufacture method of a back-side electrode structure of a back-contact solar cell. The manufacture method comprises: (1) subjecting a wafer to texturing, diffusion to produce junctions, drilling, etching and coating, and printing a back electric field while reserving hole metal electrode openings and a back electrode opening in the back electric field; (2) printing an elongated insulating sealant layer on the surface of the back electric field in an area where a via-hole row is located, and reserving an insulating sealant opening at positions where each hole metal electrode opening is located; and (3) printing a conductive slurry in the via-holes, in the hole metal electrode openings, in the insulating sealant opening, and on the upper surface of the insulating sealant opening to form a hole metal electrode. The back-side electrode structure of the back-contact solar cell provided by the invention can realize the split control of the area and shape of the welding region of the hole metal electrodes and the back electric field, thereby realizing area maximization of the back electric field, and facilitating improvement on the cell efficiency.
Description
technical field [0001] The invention relates to a back electrode structure of a back contact silicon solar cell and a preparation method thereof, belonging to the field of solar cells. Background technique [0002] Conventional fossil fuels are being exhausted day by day. Among the existing sustainable energy sources, solar energy is undoubtedly the cleanest, most common and most potential alternative energy source. At present, among all solar cells, crystalline silicon solar cells are one of the solar cells that have been widely commercialized. This is due to the extremely abundant reserves of silicon materials in the earth's crust. , has excellent electrical and mechanical properties. Therefore, crystalline silicon solar cells occupy an important position in the field of photovoltaics. [0003] At present, the back-contact silicon solar cell (MWT solar cell) has received widespread attention. Its advantages are: because there is no busbar on the front, the positive and n...
Claims
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IPC IPC(8): H01L31/0224H01L31/18
CPCY02P70/50
Inventor 李玉梅王栩生章灵军
Owner CSI CELLS CO LTD