Environment-friendly biological texture etch solution and application method thereof

A bio-environmental protection and application method technology, applied in chemical instruments and methods, crystal growth, final product manufacturing, etc., can solve the problems of uneven quality of isopropanol, endanger the survival of all species, easily pollute the working environment, etc., and achieve raw material Stable source, good storage stability, good reproducible effect

Active Publication Date: 2011-09-14
SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Invention Patent Application Publication No. CN101661974A discloses a velvet-making liquid in a solar cell and a production method thereof. The formula of the velvet-making liquid is a conventional formula, and the main disadvantages are: organic solvents such as isopropanol are very volatile in the production process. Strong, easy to pollute the working environment, and the discharged waste liquid has high COD, which brings a certain cost to the waste liquid treatment; due to the high unit price of isopropanol, the concentration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example one:

[0023] First, pour 8.6 kg of deionized water into the washed texturing tank, and add 0.5 kg of sodium citrate, 0.9 kg of anhydrous sodium carbonate and 20 ppm of alkyl glycoside BG-10 during the stirring process. Stir evenly to prepare a bio-environmental-friendly texturing liquid, and heat it to 80°C. Take the cut single crystal silicon wafer and put it in an ultrasonic bath filled with deionized water for 10 minutes, and then put the silicon wafer into the texturing tank for texturing for 25 minutes. Finally, take out the silicon wafer and put it in an ultrasonic bath filled with deionized water for ultrasonic rinsing for 10 minutes.

[0024] After the solar single wafer is textured with the above-mentioned texturing liquid, the resulting suede pyramid is small, uniform, and has a high coverage rate, and the quality difference before and after the single-chip texturing is 0.4g.

Example Embodiment

[0025] Embodiment two:

[0026] First, pour 9.5 kg of deionized water into the washed texturing tank, and add 0.2 kg of sodium citrate, 0.3 kg of anhydrous sodium carbonate and 10 ppm of alkyl glycoside APG1214 during the stirring process. Stir evenly to prepare a bio-environmental-friendly texturing liquid, and heat it to 85°C. Take the cut monocrystalline silicon wafer and put it in an ultrasonic bath filled with deionized water for 15 minutes, and then put the silicon wafer in the texturing tank for texturing for 30 minutes. Finally, take out the silicon wafer and put it in an ultrasonic bath filled with deionized water for ultrasonic rinsing for 15 minutes.

[0027] After the solar single wafer is textured with the above-mentioned texturing liquid, the resulting suede pyramid is small, uniform, and has a high coverage rate, and the quality difference before and after the single-chip texturing is 0.1g.

Example Embodiment

[0028] Embodiment three:

[0029] First, pour 7.7 kg of deionized water into the washed texturing tank, and add 0.8 kg of sodium citrate, 1.5 kg of anhydrous sodium carbonate and 80 ppm of alkyl glycoside BG-10 during the stirring process. Stir evenly to prepare a bio-environmental-friendly texturing liquid, and heat it to 75°C. Take the cut single crystal silicon wafers and put them in an ultrasonic bath filled with deionized water for 5 minutes, and then put the silicon wafers in the texturing tank for texturing for 10 minutes. Finally, the silicon wafer was taken out and placed in an ultrasonic bath filled with deionized water for ultrasonic rinsing for 5 minutes.

[0030] After the solar single wafer is textured with the above-mentioned texturing liquid, the resulting suede pyramid is small, uniform, and has a high coverage rate, and the quality difference before and after the single-chip texturing is 1.0g.

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Abstract

The invention discloses an environment-friendly biological texture etch solution and an application method thereof, particularly relates to application of the texture etch solution to a solar single wafer during processing and manufacturing of a solar silicon wafer, and belongs to the technical field of preparation of a monocrystalline silicon solar cell. The application method is characterized by comprising the following steps of: adding a non-ionic surfactant, sodium citrate, anhydrous sodium carbonate and deionized water into a cleaned texture etch groove, stirring, and mixing uniformly toprepare the environment-friendly biological texture etch solution; heating the environment-friendly biological texture etch solution to between 75 and 85 DEG C; placing cut monocrystalline silicon wafers in the environment-friendly biological texture etch solution for etching reaction after the temperature is completely stable, wherein the reaction time is between 10 and 30 minutes; and taking the silicon wafers out after texture etching, placing the silicon wafers in an ultrasound tank which is filled with the deionized water, and rinsing for 5 to 15 minutes by ultrasound. The texture surface with fine, uniform and high-coverage rate pyramids can be obtained after the solar single wafer is subjected to texture etching through the texture etch solution, and the mass difference of the wafer before etching and after etching is between 0.1 and 1.0g.

Description

technical field [0001] The invention relates to the technical field of preparation of monocrystalline silicon solar cells, in particular to a biological environment-friendly texturing liquid and an application method thereof. Background technique [0002] The research and utilization of monocrystalline silicon solar cells is one of the main ways to realize renewable energy. In the process of modern industrialization, low cost, high efficiency and high stability are the three key elements of competition in the solar cell industry. A good texture is an important prerequisite for the manufacture of high-quality monocrystalline silicon solar cells. The texturing of solar cells is to produce anisotropic corrosion on the surface of silicon wafers through chemical reactions, forming a dense texture similar to the "pyramid" pyramid structure, so that the incident light is reflected multiple times on the surface of silicon wafers, thereby Improve the absorption efficiency of inciden...

Claims

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Application Information

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IPC IPC(8): C30B33/10C23F1/14
CPCY02P70/50
Inventor 刘兵朱孔浩陈海庭
Owner SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD
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