550 / 2019-03-20 14:18:24

Tuning the photoresponse of nano-heterojunction: Pressure-induced inverse photoconductance in functionalized WO3 nanocuboids

Inverse photoconductivity,High pressure,tructural phase transition,electron trapping

全体主题 > High Pressure Physics and Materials Science

Abstract
Inverse photoconductivity (IPC) is a unique photoresponse behavior that exists in some photoconductors in which electrical conductivity decreases with irradiation, and has great potential applications in the development of new photonic devices and nonvolatile memories with low power consumption. However, it is still challenging to design and achieve IPC in most materials of interest. In this paper, we investigated pressure-driven photoconductivity in n-type WO3 nanocuboids functionalized with p-type CuO nanoparticles under visible illumination and found an interesting pressure-induced IPC in the nanocuboids accompanying a structural phase transition. The origin of the IPC is intimately connected to the depletion of the conduction channels by electron trapping and the chromic property of WO3 supported by the coexistence of W6+ and reduced W5+ ions. This synergistic rationale may afford a simple and powerful method to improve the optomechanical performance of any hybrid material in the future.