Study of Bilayer Porous Structure for Efficient Light Absorption

Abstract

In this paper, we present a novel structure for bio-inspired photochemical light absorption based on porous silicon formation technology. Macro-and microporous samples were obtained by anodic etching on highly-doped n-type silicon substrate. TiO 2 nanoparticles were synthesized by the sol-gel hydrolyzing method by immersing the samples in the precursor. After rinse and calcinations, light absorption effects were characterized by the reflective spectrums. It can be easily found that the two samples play different roles in the light absorption by comparing the spectrums before and after TiO 2 synthesization which can enhance the efficiency of energy transformation.