10.6084/M9.FIGSHARE.C.6251562.V1
Pengfei Wang
Pengfei
Wang
Duanhao Huang
Duanhao
Huang
Hao Liu
Hao
Liu
Yu Liu
Yu
Liu
Jun Yin
Jun
Yin
feng huang
feng
huang
Jia-Lin Sun
Jia-Lin
Sun
Enhanced self-powered ion-modulated photodetector based on an asymmetric composite structure of superionic conductor RbAg4I5 and graphene
Traditional strategies for self-powered devices face limitations in the performance improvement due to trade-off relationship between different parameters. Here, a new kind of ion-modulation self-powered photodetector is first proposed and fabricated by depositing superionic conductor RbAg4I5 on one side of monolayer graphene. The graphene homojunction is successfully formed at the boundary of asymmetric structure due to the formation of bound states of ions and electrons at the contact interface. This kind of homojunction avoids trade off between response parameters of traditional self-powered devices because the dissociation of bound states under light irradiation dominates the generation of photocurrent. The experimental results indicate that the prepared photodetector can achieve great photo response with responsivity of 20 mA/W and response speed of 700 μs for ultraviolet and visible light when no bias is applied, which is better than most existing graphene-based self-powered device in single or overall parameters. Further, a semi-quantitative model is systematically established according to the internal mechanism and realizes a good consistency with experimental results. The work provides a new idea and offers foundation to develop excellent self-powered devices based on superionic materials with good properties in controllability and modulation.
Photodetectors, Optical Sensors and Solar Cells
Optica Publishing Group
2022
2022-10-27
2022-10-27
Collection
10.6084/m9.figshare.c.6251562
CC BY 4.0