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Effects of pretexturization chemical processing on the optical and morphological properties of solar-grade monocrystalline silicon wafers

Surface texturization is a route to improving the efficiency of silicon solar cells by enhancing their light trapping ability. In this paper, solar-grade, monocrystalline, unpolished, silicon wafers were chemically processed via different routes before texturization. The effect of this pre-texturization processing on the morphological evolution with corresponding changes in optical properties has been systematically studied with a scanning electron microscope, atomic force microscope, and UV-Vis spectrophotometer. It has been found that the uniformity and size distribution of pyramid structures, as well as the reflectance of the textured surfaces, depend on the pre-textured chemical processing. Moreover, it has also been found that etching the oxide layer with HF prior to texturization does not affect the optical properties of textured silicon substrates.