POROUS SILICON AND ITS APPLICATION TEST FOR PHOTOVOLTAIC DEVICES

Porous silicon was prepared by anodization of a p/p(+) epitaxial c-Si wafer. Its structure was examined by electron microscopy, Raman spectr oscopy, and infrared spectroscopy. The results of the examination show that the porous Si consists of many nano-scale pores and crystalline slices, and that there is a thin molecular film containing Si-H, Si-O and SI-H-2 bonds at the surface of the slices. Some solar cells were f abricated from the porous Si wafers, and about 7% efficiency was obtai ned.