Fourth generation alcohol-free additive not additionally added in suede preparation of monocrystalline silicon

Abstract

The invention relates to a fourth generation alcohol-free additive not additionally added in suede preparation of monocrystalline silicon. The fourth generation alcohol-free additive comprises the following main components: a dispersing agent, a humectant and deionized water, wherein the dispersing agent is one of or a combination of more of styrene sodium sulfonate, benzyl naphthalenesulfonate formaldehyde condensate, sodium polyaluminate, sodium hexametahposphate, sodium methylene dinaphthalenesulfonate, sodium polysilicate, sodium lignin sulfonate and sodium polyacrylate; and the humectant is one of or a combination of more of sodium hyaluronate, D5-panthenol, glycerol, propanediol, polyethylene glycol, polypropylene glycol, honey and collagen. When the suede preparation additive is added into a suede preparation solution, clean and uniform monocrystalline silicon suede can be quickly prepared, the photoelectric conversion rate is improved, the production cost is reduced, and the environmental pollution is reduced.

Description

Technical field: [0001] The invention relates to a fourth-generation additive that is not supplemented and alcohol-free in the texturing process of monocrystalline silicon. Background technique: [0002] Texture characteristics of monocrystalline silicon solar cells are one of the important factors affecting their photoelectric conversion rate. In order to achieve a good texture effect, a mixed solution of alkali (NaOH) alcohol (isopropanol) is usually used as the corrosion system, in which Alkali is used as an etchant to corrode silicon wafers at a temperature of 75-80°C; alcohol is used as a surfactant to remove hydrogen bubbles generated by the reaction to obtain a clean and uniform surface. Ethanol has a low boiling point and is easy to volatilize. Isopropanol must be continuously added during the texture making process, otherwise white spots will appear. The first generation of texturing additive shortens the texturing time, but the consumption of isopropanol is la...

AI Technical Summary

Problems solved by technology

The first generation of texturing additive shortens the time of texturing, but the amount of isopropanol is large, the cost is high and the environment is polluted

The amount of isopropanol used in the second-generation texturing additive has been reduced, but it is still necessary to add isopropanol in each batch to maintain its effect, and the problems of pollution and high cost have not been completely solved.

The third-generation texturizing additive, although isopropanol is not used, but the amount of alkali must be increased to produce suede, and the problem of high cost still cannot be solved