Development of ultra-violet sensing devices with zinc-oxide thin-films on oxidized nano-porous-silicon substrates

Abstract

This paper demonstrated the deposition of zinc oxide (ZnO) thin films on oxidized nano-porous-Si (ONPS) substrates. Ultra-violet (UV) sensing devices based on the developed ZnO films had been fabricated and exhibited high photo-responsivity for 300~400-nm incident UV light. The ZnO-on-ONPS devices got a large photo-to-dark current ratio up to 104 at an incident wavelength of 375 nm, indicating their high potential for development of low-cost UV photodetectors.