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Monocrystalline silicon solar cell alkali texturing assistant agent and its application

A technology of solar cells and auxiliary agents, which is applied in the field of alkali texturing technology, can solve the problems of high cost of isopropanol, unbalanced chemical solution ratio, etc., and achieve the effect of improving process stability and consistency

Inactive Publication Date: 2014-07-16
上海晶太新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boiling point of isopropanol (or alcohol) is relatively low, around 82°C, so isopropanol will volatilize out of the texturing tank as the reaction proceeds, resulting in an imbalance in the ratio of the liquid medicine in the texturing tank
In the currently used alkali texturing process, isopropanol is basically added after each batch to make up for the amount of volatilization, resulting in the consumption of isopropanol accounting for a large cost in texturing, and It also puts pressure on water treatment and the production environment

Method used

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  • Monocrystalline silicon solar cell alkali texturing assistant agent and its application
  • Monocrystalline silicon solar cell alkali texturing assistant agent and its application
  • Monocrystalline silicon solar cell alkali texturing assistant agent and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0028] An alkaline texturing auxiliary agent for monocrystalline silicon solar cells, the texturing auxiliary agent includes component A and component B, the proportion of component A is 20% of ethylene glycol content, 0.05% of methyl pyruvate content, Vitamin C content is 0.1%, oxalic acid content is 1%, lactic acid content is 0.3%, NaOH content is 2.0%, and the rest is deionized water. Add 2000ml of auxiliary agent prepared according to the above formula into a 100L single crystal texturing tank. The NaOH content in the texturing tank has been configured to be 1.2%, and the temperature of the texturing tank is controlled at 80°C. Soak it in the velvet-making tank for reaction, the velvet-making time is controlled at 900 seconds to 1200 seconds, and the average size of the velvet pyramids obtained is about 5um. Each subsequent batch (the number of batches of silicon wafers is 300-400 pieces) needs to be supplemented with 50ml of component B liquid medicine and 200-300 grams o...

Embodiment 2

[0030] An alkaline texturing auxiliary agent for monocrystalline silicon solar cells, the texturing auxiliary agent includes component A and component B, the proportion of component A is 40% ethylene glycol content, 0.05% methyl pyruvate content, Vitamin C content is 0.1%, oxalic acid content is 1%, lactic acid content is 0.3%, NaOH content is 2.0%, and the rest is deionized water. Add 2000ml of auxiliary agent prepared according to the above formula into a 100L single crystal texturing tank. The NaOH content in the texturing tank has been configured to be 1.2%, and the temperature of the texturing tank is controlled at 80°C. Soak in the texture-making tank for reaction, the texture-making time is controlled at 1200 seconds to 1500 seconds, and the average size of the obtained texture pyramid is about 3um. Each subsequent batch (the number of batches of silicon wafers is 300-400 pieces) needs to be supplemented with 50ml of component B liquid medicine and 200-300 grams of NaOH...

Embodiment 3

[0033] An alkali texturizing auxiliary agent for monocrystalline silicon solar cells, comprising component A and component B, component A comprising the following components and their weight percentages: ethylene glycol 10%, methyl pyruvate 0.01%, vitamin C 0.01%, 0.1% oxalic acid, 0.01% lactic acid, 0.1% NaOH, and the balance is deionized water; component B includes the following components and weight percentage content: methyl pyruvate 0.01%, vitamin C 0.01%, oxalic acid 0.1% %, 0.01% lactic acid, 0.1% NaOH, and the balance is deionized water, wherein the conductive resistance of the deionized water used is more than 18MΩ.

[0034] The alkaline texturizing auxiliary agent for monocrystalline silicon solar cells has the following purposes: the configured component A is placed in a single crystal texturing tank containing a NaOH solution with a concentration of 1 wt%, and the volume of the added component A and alkali solution The ratio is 1:40, and the temperature of the text...

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Abstract

The invention relates to a monocrystalline silicon solar cell alkali texturing assistant agent and its application. The texturing assistant agent comprises ingredient A and ingredient B. When in use, the ingredient A is put into an aqueous alkali-containing monocrystalline texturing groove; the texturing groove temperature is controlled at 80 DEG C; after uniformly stirring, a monocrystalline silicon wafer is immersed in the texturing groove for a texturing reaction; the reacted monocrystalline silicon wafer is taken out and a new monocrystalline silicon wafer is put into the texturing groove; the ingredient B and solid base are added further for a texturing reaction; and the above operation is repeated until the content of a reaction resultant Na2SiO3 in the texturing groove is more than 10 wt%. In comparison with the prior art, based on the realization of uniform density of the monocrystalline alkali texturing surface, isopropanol is not needed in the invention, thus raising the stability and consistency of the monocrystalline texturing technology.

Description

technical field [0001] The invention relates to an alkali texturing process in a monocrystalline silicon solar cell manufacturing process, in particular to an alkali texturizing auxiliary agent for a monocrystalline silicon solar cell and its application. Background technique [0002] The preparation process of monocrystalline silicon solar cells mainly includes six steps: (1) chemical thinning, texturing and cleaning; (2) diffusion to prepare PN junction; (3) etching to remove edges and cleaning; (4) preparation of anti-reflection membrane; (5) screen printed electrodes and sintered; (6) cell test sorting. Through the six-step process, solar cells based on monocrystalline silicon crystals are prepared, and then through packaging technology, monolithic crystalline silicon cells are combined into modules for photovoltaic power generation applications. [0003] The first step of the process is mainly texturing. The main function of texturing is to form undulations similar to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B33/10
Inventor 章亚男叶俊
Owner 上海晶太新能源科技有限公司