A comparative study of photoconductivity decay in ZnO-based MSM structures and nanowires

Abstract

Comparative analysis of transient photoconductivity in ZnO-based MSM structures and nanowires is performed in this paper. The measurements are carried out at room temperature in ambient air. The mechanisms of photoconductivity decay are discussed taking into account the range of measured relaxation times. It is found that the photoconductivity decay is determined by bulk effects in MSM structures, while it is governed by surface states and surface band bending effects in networks of nanowires.