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Single-side suede preparation method of crystal silicon solar cell

A technology of solar cells and crystalline silicon, applied in the field of solar cells, can solve problems such as uninvolved, many process steps, and reduce compounding on the back of silicon wafers, so as to achieve the effects of reducing production costs, improving production efficiency, and reducing chemical consumption

Active Publication Date: 2018-04-13
JIA XING SHANGNENG PHOTOVOLTAIC MATERIALS SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its focus is on the preparation of a single-sided suede surface, which can achieve a suede surface with excellent light-trapping performance on the front side of the silicon wafer.

Method used

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  • Single-side suede preparation method of crystal silicon solar cell
  • Single-side suede preparation method of crystal silicon solar cell
  • Single-side suede preparation method of crystal silicon solar cell

Examples

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preparation example Construction

[0049] ginseng figure 1 As shown, the invention discloses a method for preparing a single-sided suede surface of a crystalline silicon solar cell, comprising the following steps:

[0050]S1. Stack the silicon wafers in pairs to obtain a tightly adsorbed laminated structure and then insert them into the silicon wafer flower basket.

[0051] Schematic diagram of the structure of the silicon wafer flower basket 20 figure 2 As shown, it is exactly the same as the existing silicon flower basket, and the two side walls of the silicon flower basket are correspondingly provided with several slots 21. Preferably, the silicon flower basket in the present invention contains 25 correspondingly arranged slots, each Two stacked silicon chips can be inserted into each corresponding slot, and a total of 50 silicon chips can be inserted. Of course, the number of slots can be changed according to needs, for example, 50 slots can be set, and 100 silicon chips can be inserted correspondingly, ...

Embodiment 1

[0080] A method for preparing a single-sided textured surface of a crystalline silicon solar cell, comprising the steps of:

[0081] 1. Chemically etch or polish the P-type polysilicon wafers with a size of 156.75mm×156.75mm and a thickness of 180±10μm on both sides, stack 50 pieces of the above-mentioned polished silicon wafers in pairs to obtain a tightly adsorbed laminated structure, and then insert 25 pieces Standard silicon wafer flower basket for texturing;

[0082] 2. Put the flower basket of silicon wafers directly into the acidic texturing solution for the texturing process. The main steps include:

[0083] 1) Put the flower basket of silicon wafers into the 3 In the HF solution, the HF concentration is 0.1mol / L, and the Ag attachment reaction is carried out at room temperature for 30s;

[0084] 2) Put the stacked silicon wafer structure after the previous step into HF and H 2 o 2 In the mixed solution, the concentrations were 3mol / L and 0.1mol / L respectively, and...

Embodiment 2

[0091] A method for preparing a single-sided textured surface of a crystalline silicon solar cell, comprising the steps of:

[0092] 1. Chemically etch or polish the P-type monocrystalline silicon wafers with a size of 156.75mm×156.75mm and a thickness of 180±10μm on both sides, and stack 50 pieces of the above-mentioned polished silicon wafers in pairs to obtain a tightly adsorbed laminated structure. Insert 25 pieces of special silicon wafer flower basket for texturing;

[0093] 2. Put the flower basket of silicon wafers directly into the alkaline texturing liquid for the texturing process. The main steps include:

[0094] Put the flower basket of silicon wafer directly into the texturing solution to carry out the texturing process. The main steps include: putting it into the KOH solution with a concentration of 2% containing single crystal texturing additives, and reacting at 80°C for 500s;

[0095] 3. Separating the above-mentioned stacked structure to obtain a silicon wa...

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Abstract

The invention discloses a single-side suede preparation method of a crystal silicon solar cell. The method comprises the following steps: S1, laminating each two silicon wafers to obtain a firmly attached laminated structure, and inserting the laminated structure into a silicon wafer flower basket; S2, directly placing the silicon wafer flower basket in suede making liquid to perform a suede making process so as to obtain suede on the two surfaces of the laminated structure; and S3, separating the laminated structure to obtain silicon wafers with single-side suede. The preparation method disclosed by the invention is simple in process, only the necessary suede is formed on the outer surface, the complex suede making process on the respective back surfaces of the laminated silicon wafers can be avoided, and the computability of the back surface structure subjected to simple polishing treatment with the existing industrial production process is good; and in the case of equivalent processsteps, the roughness of the back surfaces of the silicon wafers can be reduced, the compounding of the back surfaces of the silicon wafers is greatly reduced, the service lives of the surfaces of thesilicon wafers after the suede making are prolonged, and thus the photoelectric conversion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a single-sided suede surface of a crystalline silicon solar cell. Background technique [0002] Photovoltaic power generation is an important component of new energy, and has achieved rapid development in recent years. Among the current commercialized solar cell products, crystalline silicon (monocrystalline and polycrystalline) solar cells have the largest market share, and have maintained a market share close to 90%. [0003] At present, in the production process of crystalline silicon solar cells, the main purpose of the texturing process is to remove the cutting damage layer on the surface of the silicon wafer and form a light-trapping texture structure to reduce the surface reflectivity of the solar cell, thereby improving the photoelectric conversion efficiency of the solar cell. Among them, the chemical etching of monocrystalline silicon based o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0236
CPCH01L31/02363Y02E10/50
Inventor 查嘉伟苏晓东
Owner JIA XING SHANGNENG PHOTOVOLTAIC MATERIALS SCI & TECH CO LTD
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