Corrosive liquid for preparing monocrystal silicon textured surface and method thereof

Abstract

The invention relates to a corrosive liquid for preparing monocrystal silicon textured surfaces and a method thereof. The corrosive liquid comprises an alkali solution, sodium silicate and isopropanol, and is characterized by also comprising a perfluoro octoate aqueous solution, wherein the perfluoro octoate aqueous solution has the volume percent of 0.2-1 percent and the concentration within a range of 5*10<-5>-5*10<-3>mol / L; the alkali solution has the mass percent of 1-2.5 percent, the sodium silicate has the mass percent of 0.1-2 percent, and the isopropanol has the volume percent of 0.3-2 percent; and the alkali solution is sodium hydroxide or potassium hydroxide or sodium carbonate. The corrosive liquid has low cost, pyramids formed on the prepared monocrystal silicon textured surfaces have small and uniform sizes, and the corrosive liquid is favorable for solar energy absorption and can be widely applied to the field of solar batteries.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to an etching solution and a method for preparing monocrystalline silicon textured surfaces. Background technique [0002] Low-cost, high-efficiency solar cells have always been the focus of people's pursuit. Currently, surface texturing of monocrystalline silicon solar cells is one of the effective means to improve the conversion efficiency of solar cells. Usually, the main method of texturing is the alkali etching method. The alkali etching method is to add various buffers, such as isopropanol, ethanol, sodium silicate, etc., to the alkali etching solution to control the reaction rate, so as to obtain For the suede surface with pyramid shape, the smaller and more uniform the size of the pyramid shape, the stronger the light absorption ability of monocrystalline silicon, and the higher the conversion efficiency of solar cells. At present, isopropanol is mainly used as a buffer...

AI Technical Summary

Problems solved by technology

However, due to the high cost of isopropanol, high volatility, large amount of use, and the need to continuously replenish the solution during the production process, resulting in increased costs

Moreover, the above-mentioned etching solution makes the thickness of monocrystalline silicon corroded too large, the thickness becomes thinner and more brittle, and the easy fracture will further increase the production cost.

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