Issue 19, 2022

Performance enhancement of a self-powered imaging CsPbBr3 photodetector by tuning the trap effects of carriers

Abstract

Perovskite photodetectors (PDs) have received extensive attention from researchers due to their potential applications in imaging and visual sensing. Among them, metal–semiconductor–metal (MSM) PDs with a simple preparation process and low cost are considered to be the most suitable structure type for practical applications. However, their applications are limited by their poor responsivities due to the high recombination efficiency of photogenerated electrons and holes in the light-absorbing layer. In this work, carrier traps were introduced into the light-absorbing layer to reduce photo-generated carrier recombination and improve the performance of the PD. PDs based on the CsPbBr3 : ZnO light-absorbing layer are constructed, in which ZnO quantum dots (QDs) act as electron trap states. When the ZnO QD concentration is 1.5 wt% in the light-absorbing layer, the PD shows the best responsivity (about 5.5 times that of the CsPbBr3 PD). A self-powered photodetector was realized by designing a novel planar asymmetric Au interdigital electrode, which modulates the Schottky barrier height at the interface of Au/light-absorbing layer. It exhibits a responsivity of 0.24 mA W−1 under 500 nm light illumination and fast response characteristics (680 ns rise time and 436 μs decay time) without an external power supply. This work provides a reliable approach and a low-cost strategy to construct high-performance self-powered PDs.

Graphical abstract: Performance enhancement of a self-powered imaging CsPbBr3 photodetector by tuning the trap effects of carriers

Supplementary files

Article information

Article type
Paper
Submitted
20 Mar 2022
Accepted
26 Apr 2022
First published
26 Apr 2022

J. Mater. Chem. C, 2022,10, 7460-7468

Performance enhancement of a self-powered imaging CsPbBr3 photodetector by tuning the trap effects of carriers

W. Gong, Y. Tian, J. Yan, F. Gao and L. Li, J. Mater. Chem. C, 2022, 10, 7460 DOI: 10.1039/D2TC01124G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements