Environment-friendly biological texture etch solution and application method thereof

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...

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 is high, the required corrosion time is long, the cost increases, and the use economy is poor; The quality of isopropanol in the market is uneven, which also has a certain impact on the texturing effect of solar silicon wafers, and the yield is difficult to control

However, the substitutes used are alkylphenol polyoxyethylene ether series surfactants, which have poor biodegradability, strong lipophilicity, are easy to accumulate in sludge and organisms, and may endanger all species through the food chain through chronic effects survival