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Heterojunction solar cell and preparation method thereof

A solar cell and heterojunction technology, which is applied in chemical instruments and methods, circuits, photovoltaic power generation, etc., can solve the problems of low efficiency of solar cells and achieve the effects of improving contact, increasing welding tension, and reducing widening

Pending Publication Date: 2021-09-21
宣城睿晖宣晟企业管理中心合伙企业(有限合伙)
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Problems solved by technology

[0005] In view of this, the embodiment of the present application provides a heterojunction solar cell and its preparation method, which at least partly solves the problem that the silver paste cannot be in good contact with the bottom of the textured surface when printing the silver paste in the method of the prior art, resulting in a solar cell The problem of low volume usage efficiency

Method used

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  • Heterojunction solar cell and preparation method thereof
  • Heterojunction solar cell and preparation method thereof
  • Heterojunction solar cell and preparation method thereof

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Embodiment approach

[0059] 1. N-type monocrystalline silicon wafers are initially cleaned. Ultrasonic cleaning is used for cleaning. The solution is

[0060] Acetone for 5 minutes;

[0061] 2. Use a screen printing machine to print photoresist on the surface of the battery. The pattern of the photoresist is the same as that of the subsequent grid lines;

[0062] 3. Put the silicon wafer with photoresist into the texturing tank for texturing. The texturing solution is NaOH and texturing additive at a temperature of 80°C for 20 minutes; in the area covered by the photoresist, the texturing solution It cannot be in contact with the silicon wafer, so it will not form a pyramid-shaped textured structure at the corresponding position on the silicon wafer, and the area not covered by the photoresist can be in contact with the texturing liquid to form a normal textured surface;

[0063] 4. After texturing, remove the photoresist, and then put the silicon wafer into the cleaning tank for cleaning. After ...

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Abstract

The invention provides a preparation method of a heterojunction solar cell, belongs to the technical field of a solar cell processing method, and at least partially solves the problem that the use efficiency of the solar cell is low due to the fact that silver paste cannot be in good contact with the bottom of a suede when the silver paste is printed in the prior art. The preparation method comprises the following steps: cleaning a silicon wafer for a preset time; printing photoresist on the surface of the cleaned silicon wafer by adopting a silk-screen printing process, wherein the pattern of the photoresist is the same as a preset grid line pattern; texturing the silicon wafer with the photoresist; removing the photoresist on the silicon wafer, and cleaning; forming an amorphous silicon film on the silicon wafer; forming a transparent conductive film on the amorphous silicon film; and forming a grid line of the preset pattern on the transparent conductive film. According to the processing scheme, the use efficiency of the heterojunction solar cell is improved.

Description

technical field [0001] The present application relates to the technical field of solar cell processing methods, in particular to a heterojunction solar cell and a preparation method thereof. Background technique [0002] Silicon-based heterojunction, referred to as SHJ, is Si-basedheterojunction. Silicon-based heterojunction cell is one of several mainstream high-efficiency solar cell technologies at present. It has high conversion efficiency and low temperature coefficient. It is an important direction for the development of solar cells and has broad market prospects. Conventional heterojunction The structure of the battery is as figure 1 shown. Normally, a silicon-based heterojunction battery includes silver grid lines 3 and the main part of the battery from top to bottom, wherein the main part of the battery includes a silicon wafer 1 and a textured surface formed on the surface of the silicon wafer 1 after texturing, Suede is like figure 1 In the region of the pyrami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/074C30B33/10
CPCH01L31/1804H01L31/1876H01L31/074C30B33/10Y02P70/50Y02E10/547
Inventor 不公告发明人
Owner 宣城睿晖宣晟企业管理中心合伙企业(有限合伙)
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