Environment-friendly efficient and microporous-starch-containing monocrystalline silicon solar cell piece surface texture liquid and preparation method therefor

Abstract

The invention discloses an environment-friendly efficient and microporous-starch-containing monocrystalline silicon solar cell piece surface texture liquid. The monocrystalline silicon solar cell piece surface texture liquid is prepared from the following raw materials in parts by weight: 0.1-0.15 parts of microporous starch, 0.05-0.1 parts of polyaspartic acid, 1.5-2.5 parts of styrene, 1-2 parts of 5-10% of ammonium persulfate solution, 0.1-0.2 parts of lauryl sodium sulfate, 0.05-0.1 parts of soapnut saponin emulsion, 0.1-0.15 parts of dodecafluoroheptyl-propyl-trimethoxysilane, 3-5 parts of sodium hydroxide, 0.3-0.5 parts of citric acid, 0.03-0.05 parts of ethylene diamine tetraacetic acid and 100-120 parts of water. The silicon wafer texture liquid provided by the invention has relatively high reaction speed, moderate corrosion, low thinning amount and high repeating utilization factor; the impurities generated in the reaction can be effectively reduced; the service life can be prolonged; the prepared textured pyramid has a uniform size and relatively small granules; in addition, a green and environmental protection effect, and high photoelectric conversion efficiency are achieved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to an environment-friendly and high-efficiency monocrystalline silicon solar cell surface texture liquid containing microporous starch and a preparation method thereof. Background technique [0002] As the world's energy crisis becomes more serious, solar energy has become the most potential alternative energy source, and a solar cell is an electronic component that directly converts solar energy into electrical energy. The main problem hindering the development of solar cell technology is its high manufacturing cost. At present, in order to reduce the cost of monocrystalline silicon solar cells and improve the photoelectric conversion efficiency, silicon surface texturing is the easiest and most efficient method. Texture, also known as velvet, uses the principle of light trapping to make the incident light reflect multiple times to prolong its propagation path on the surface o...

AI Technical Summary

Problems solved by technology

[0003] At present, chemical etching is the most commonly used method for surface texture of single crystal silicon, and the commonly used texturing liquid is NaOH / isopropanol system, but isopropanol is expensive, volatilizes quickly, costs high and is not conducive to environmental protection

Patent 201010161287.8 discloses a monocrystalline silicon additive texturing solution, which is composed of alkaline corrosion solution, surfactant and organic acid or salt, does not contain isopropanol and is fast and efficient, but it has the problem of poor uniformity of reaction, which is easy to cause After texture, the pyramids on the silicon surface are too large and local over-corrosion, etc., the quality of the silicon wafers needs to be further improved