Bamboo extraction solution silicon wafer texture-etchant and preparation method therefor

Abstract

The invention discloses a bamboo extraction solution silicon wafer texture-etchant which is characterized by being prepared from the following raw materials in parts by weight: 10-15 parts of fresh bamboo leaves, 3-5 parts of sodium tripolyphosphate, 0.3-0.5 part of sodium carbonate, 1.5-2.5 parts of sodium hydroxide, 0.5-1 part of octadecyl diethoxy glycine betaine, 5-10 parts of a texture-etching adjuster, 0.2-0.4 part of cottonseed oil, 1-2 parts of polyethylene glycol, 0.3-0.5 part of xanthan gum and 100-150 parts of water. The silicon wafer texture-etchant disclosed by the invention not only can improve the texture-etching efficiency and the stability of a texture-etching process and effectively improve the conversion efficiency of a battery sheet, but also can reduce the texture-etching corrosion amount, reduce the wrapping degree of the silicon wafer, and reduce fragments. The silicon wafer texture-etchant is non-toxic and harmless, and safe and environmental-friendly, and the product is stable in quality.

Description

technical field [0001] The invention relates to silicon chip texturing technology, in particular to a silicon chip texturing agent of bamboo leaf extract and a preparation method thereof. Background technique [0002] Texturing is an important process in the production process of solar cells. Using the principle of anisotropic corrosion of single crystal silicon by low-concentration alkaline etching solution, a "pyramid" structure is formed on the surface of the silicon wafer to reduce the reflectivity of the silicon wafer surface and increase Absorb light, reduce reflectivity, and improve conversion efficiency of solar cells. At present, the conventional texturing process generally uses sodium hydroxide or potassium hydroxide, and adds a suitable mixed solution of isopropanol and sodium silicate for texturing. The isopropanol and other components used in the existing texturing liquid have large volatilization, poor environmental protection, short service life, large chemic...

AI Technical Summary

Problems solved by technology

The isopropanol and other components used in the existing texturing liquid have large volatilization, poor environmental protection, short service life, large chemical consumption, low reaction controllability, and poor texturing repeatability, which directly affect product quality

Moreover, the corrosion of silicon wafers is not easy to control, the control of the textured surface is unstable, the amount of corrosion of the textured texture is large, and the fragmentation rate is high, resulting in great waste