Monocrystalline solar cell texturing process

Abstract

The invention discloses a monocrystal-like solar battery texturing process which comprises the following steps: placing a silicon wafer into a HNO3 and HF mixed acid solution for corrosion; taking out the treated silicon wafer from the mixed acid solution when the corrosion depth of the silicon wafer is up to 2-5 micrometers; carrying out water washing and drying treatment on the silicon wafer after acid corrosion; placing the dried silicon wafer into KOH or NaOH aqueous alkali with a single crystal for corrosion; taking out the silicon wafer from the aqueous alkali when the corrosion depth of the silicon wafer is up to 2-5 micrometers; and carrying out water washing and drying treatment on the silicon wafer after alkali corrosion. According to the process, the texturing treatment is carried out on the silicon wafer, a battery piece which is manufactured by the silicon wafer treated by using the process is small in reflectivity difference rate among crystalline grains with different sizes, and has better anti-damping performances.

Description

technical field [0001] The invention relates to the field of photovoltaics, in particular to a texture-making process for quasi-single crystal solar cells. Background technique [0002] Quasi-monocrystalline silicon wafers refer to mixed crystalline silicon wafers that are dominated by single crystal phases but contain partial polycrystalline phases. The grain size of quasi-single crystals is close to that of single crystals, the quality is better than that of polycrystalline silicon, and the cost is close to that of ingot polycrystalline silicon. The application of single crystals is more and more extensive. Silicon wafers need to be textured when they are used to manufacture solar cells. At present, polycrystalline silicon is made of mixed acid solution at low temperature, and the porous texture is obtained after isotropic corrosion of the silicon wafer surface by mixed acid. Monocrystalline silicon is made of alkali solution at high temperature. The pyramid texture is ob...

AI Technical Summary

Problems solved by technology

However, due to the different grain sizes on the surface of quasi-monocrystalline silicon wafers, the uneven distribution of impurities and grain boundaries, the power conversion efficiency of cells made of silicon wafers after acid texturing will be reduced, and the anisotropic corrosion of silicon wafers after alkali texturing The differences in the reflectivity of different grains lead to a difference of more than 16% in reflectivity, a large difference in appearance, large dispersion of efficiency and serious attenuation

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