A novel approach on the surface treatment of multi-crystalline silicon is reported.The method uses a HNO3-rich HF/HNO3 mixture for the first texturing treatment and a HF-rich HF/HNO3 mixture for the secondan texturing,which results in lower reflectivity on silicon surface.After texturing treatment,scanning electron microscopy(SEM) and Carry 5000 spectrophotometer are utilized to determine optical properties of silicon surface.The reflectivity(without ARC) of wafers using secondary texturing treatment is mar...