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Alcohol-free etching liquid for monocrystalline silicon solar cells

A technology of solar cells and monocrystalline silicon, applied in the field of solar cells, can solve the problems that have not been well solved, limited experimental conditions, flammable and explosive, etc., and achieves short texturing time, low reflectivity, and textured effect. Good results

Active Publication Date: 2015-03-25
EASTSKY PHARM ANHUI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the surface texturing of monocrystalline silicon cells has been studied for many years, the problem of high-performance large-area uniform texture has not been well resolved. The problem that often touches the sword is the process repeatability, uniformity, " The control of the size of the "pyramid" mainly uses a mixture of sodium hydroxide or potassium hydroxide, water, and isopropanol (IPA) to make texture, but isopropanol (IPA) has a low boiling point, is flammable and explosive, and limits Its experimental conditions and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] NaOH 1-3%

[0019] Potassium guaiacol sulfonate 5-15%

[0020] The balance of deionized water, the total is 100%

[0021] Preparation method: first add deionized water into the reaction kettle, slowly add NaOH under stirring, stir to dissolve, then add potassium guaiacolsulfonate until it is completely dissolved.

[0022] Immerse the monocrystalline silicon wafer in the above-mentioned non-alcoholic texturing solution, control the temperature at 80-90°C, and take 10-25 minutes to obtain a textured structure covered with pyramids on the surface of the silicon wafer. Crystal silicon wafers can enter the next process after post-processing.

Embodiment 2

[0024] NaOH 1-3%

[0025] Sodium 5-Nitroguaiacol 5-15%

[0026] The balance of deionized water, the total is 100%

[0027] Preparation method: first add deionized water into the reaction kettle, slowly add NaOH under stirring, stir to dissolve, then add 5-nitroguaiacol sodium until it is completely dissolved.

[0028] Immerse the monocrystalline silicon wafer in the above-mentioned alcohol-free texturing solution, the temperature is controlled at 80-90°C, and the time is 10-25 minutes to form a textured structure covered with pyramids on the surface of the silicon wafer, and the size of the pyramid structure is less than 2.5μm, uniform size, no white spot, is an ideal conical pyramid structure, reflectivity is less than 10%, improves the photoelectric conversion rate, improves product quality as a whole, and reduces cost. After the film is processed, it can enter the next process.

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Abstract

The invention discloses alcohol-free etching liquid for monocrystalline silicon solar cells. The alcohol-free etching liquid is prepared by raw materials including, in weight percentage, from 1 to 3% of NaOH, from 5 to 15% of water-soluble guaiacol derivative and the balance deionized water, and the total weight percentage of the raw materials is 100%. The water-soluble guaiacol derivative replaces isopropanol (IPA), magical permeability and surface activity of the water-soluble guaiacol derivative are used for preparing 'pyramid' suede with the uniform size, and accordingly photoelectric conversion efficiency of the solar cells is improved.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to an alcohol-free texturing solution for monocrystalline silicon solar cells. Background technique [0002] The photovoltaic industry has grown rapidly in recent years. The average annual growth rate of solar cells / modules in the past 10 years is 42.7%, and the average growth rate in the past 5 years is 51%. It has entered the era of selling energy. The strong market demand has prompted major companies to The capacity expansion has also prompted various research institutions to invest financial resources and manpower to continuously improve the photoelectric conversion efficiency of the current battery and develop a new generation of solar cells. [0003] One of the main measures to improve the photoelectric conversion efficiency of a single-product silicon solar cell is to reduce the optical reflection of the cell, which can be realized by depositing an anti-reflection film and surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B33/10C23F1/32
Inventor 付雪莲黄伟冯升平于振云于素云
Owner EASTSKY PHARM ANHUI TECH
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