n-ZnO/LaAlO_3/p-Si heterojunction for visible-blind UV detection

Abstract

A visible-blind UV photodetector (PD) using a double heterojunction of n-ZnO/LaAlO 3 (LAO)/p-Si was demonstrated. Inserted LAO layers exhibit electrical insulating properties and serve as blocking layers for photoexcited electrons from p-Si to n-ZnO, leading to an enhanced rectification ratio and a visible-blind UV detectivity of the n-ZnO/LAO/p-Si PDs due to the high potential barrier between LAO and p-Si layers (∼2.0 eV). These results support the use of n-ZnO/LAO/p-Si PDs in the visible-blind UV PDs in a visible-light environment. © 2012 Optical Society of America.