High-response ultraviolet photodetector based on N,N’-bis(naphthalen-1-yl)-N,N’-bis(phenyl)benzidine and 2-(4-tertbutylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole

Abstract

A high-performance heterojunction ultraviolet (UV) photodetector based on N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)ben-zidine (NPB) and 2-(4-tertbutylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole (PBD) has been fabricated. The J-V characteristic curves of the device demonstrate a more than 4 orders of magnitude difference when illuminated under a 350 nm UV light and in the dark at +3 V. The device exhibits high sensitivity in the 300-420 nm region with the peak located around 350 nm. A high photocurrent response of 4.5 A/W at +3 V under an incident intensity of 60 microW/cm2 was achieved. These results indicate that the NPB/PBD heterojunction structure device might be used as low-cost UV photodetectors.