Applied Porous Silicon on Multicrystalline Solar Cells

The stain etching method was applied to form porous silicon on monocrystalline silicon and multicrystalline silicon in order to improve the surface absorption.Different HF and HNO_3 solutions at room temperature are adopted.Observe the porous surface through micro-scope and SEM.Optical properties of the porous silicon were investigated by reflectance spectroscopy.One step stain etching is adopted to fabricate porous silicon on 1 cm×1 cm monocrystalline and multicrystalline silicon solar cells.It is shown that porous silicon is very important to improve the efficiency monocrystalline and multicrystalline silicon solar cells.