Polycrystalline silicon solar cell, preparation method and method for preparing textured structure thereof
A technology for solar cells and polysilicon, applied in the field of solar cells, can solve the problems of reducing the light trapping effect of the suede surface and the conversion efficiency of the cell, increasing the ratio of the velvet of the polycrystalline silicon solar cell, etc., so as to improve the photoelectric conversion efficiency and the light trapping effect, reduce the The effect of the velvet ratio
Active Publication Date: 2022-05-31
YANCHENG CANADIAN SOLAR INC +2
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Problems solved by technology
[0003] However, for polycrystalline silicon wafers, there are some defects when the ingot is cast due to the fact that there are many impurities in the raw material itself. Therefore, when the black silicon texturing process is used to prepare the textured structure, there will be some recombination centers that do not participate in photoelectric conversion, which increases the The ratio of velvet to polycrystalline silicon solar cells reduces the light-trapping effect of the velvet surface and the conversion efficiency of the battery
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[0036] figure 1 A flowchart of a method for preparing a textured structure of a polycrystalline silicon solar cell provided by an embodiment of the present invention. like figure 1 As shown, the method for preparing the textured structure of a polycrystalline silicon solar cell according to the embodiment of the present invention includes at least steps a-c.
[0037] In step a, the silicon wafer is put into a solution containing metal silver ions, and a porous layer structure is formed on the surface of the silicon wafer.
[0038] Dig holes in silicon wafers by adopting metal ion wet etching process, that is, electrochemical corrosion occurs between metal ions and contacted silicon atoms to corrode silicon wafers directionally, so as to form a porous layer structure on the surface of silicon wafers, and, because the solution contains Metal silver ions, therefore, silver particles will be attached in the formed porous layer structure.
[0039] In an embodiment, the silicon w...
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Abstract
The invention discloses a polycrystalline silicon solar cell, a preparation method thereof, and a method for preparing the textured structure thereof. The method for preparing the textured structure of the polycrystalline silicon solar cell includes: a. putting a silicon chip into a solution containing metallic silver ions, and Form a porous layer structure on the surface of the silicon wafer; b, put the silicon wafer including the porous layer structure into the HCL solution to form an AgCL protective layer; c, put the silicon wafer with the AgCL protective layer into the second etching solution, In order to obtain the textured structure of the polycrystalline silicon solar cell. The method can reduce the velvet ratio of the polycrystalline silicon solar cell, and improve the light trapping effect and cell conversion efficiency.
Description
technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a textured structure of a polycrystalline silicon solar cell, a method for preparing a polycrystalline silicon solar cell and the polycrystalline silicon solar cell. Background technique [0002] The photovoltaic industry occupies an important position in the new energy development plan. At present, polysilicon solar cells have become the mainstream of the solar cell market. The quality of the textured surface of silicon wafers has an important impact on the conversion efficiency of solar cells, and the surface textured technology of polysilicon has attracted more and more attention from all over the world. [0003] However, for polycrystalline silicon wafers, there are some defects when the ingot is cast due to the fact that there are many impurities in the raw material itself. Therefore, when the black silicon texturing process is used to prepare the ...
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IPC IPC(8): H01L31/18H01L31/0236C30B33/10
CPCH01L31/18H01L31/02366C30B33/10Y02P70/50
Inventor 沈波涛刘龙杰张彬
Owner YANCHENG CANADIAN SOLAR INC