Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure.

ABSTRACT: A dual-functional ultraviolet (UV) photodetector with a large UV-to-visible rejection ratio is presented, in which interdigitated finger-type two-dimensional graphene electrodes are introduced to an AlGaN/GaN heterostructure. Two photocurrent generation mechanisms of photovoltaic and photoconductive dominances coexist in the device. The dominance of the mechanisms changes with the induced bias voltage. Below a threshold voltage, the device showed fairly low responsivities but fast response times, as well as a constant photocurrent against the induced bias. However, the opposite characteristics appeared with high bias voltage. Specifically, above the threshold voltage, the device showed high responsivities with additional gain, but slow rise and recovery times. For instance, the responsivit

SUBMITTER: Pandit B 

PROVIDER: S-EPMC7745009 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature