Long-acting silicon wafer texture-etchant and preparation method therefor

Abstract

The invention discloses a long-acting silicon wafer texture-etchant which is characterized by being prepared from the following raw materials in parts by weight: 0.1-0.2 part of dodecyl benzyl dimethyl ammonium chloride, 2-4 parts of triethanolamine, 1.5-2.5 parts of sodium hydroxide, 1-2 parts of glycerine ethoxylate, 1-2 parts of sodium perborate, 2-4 parts of ethylenediamine tetraacetic acid disodium, 0.2-0.4 part of barium petroleum sulfonate, 1-2 parts of hydroxyethyl cellulose, 5-10 parts of a texture-etching adjuster 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 effectively solve the problem of instability of the texture-etchant in a using process, so that the service life of a solution is prolonged, the production cost is lowered and the product is stable in quality.

Description

technical field [0001] The invention relates to silicon wafer texturing technology, in particular to a long-acting silicon wafer texturing agent 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 chemical consum...

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, with the prolongation of the texturing time, the texturing effect becomes worse, and a uniform and ideal pyramid-sized suede cannot be obtained, so a new reaction solution must be replaced, which increases the cost.