Issue 15, 2022

Macroscopic and microscopic defect management in blue/green photodetectors for underwater wireless optical communication

Abstract

Hybrid organic–inorganic metal halide perovskites have attracted significant attention due to their excellent optical and electrical properties. However, intrinsic defects and poor carrier mobility remain two major concerns that limit the photoresponse of perovskite-based photodetectors. Here, a modified bromide-terminated Ti3C2 MXene nanoparticle (Br-MNP) decorating scheme is proposed to reduce macroscopic and microscopic defects and facilitates carrier transport. Specifically, Br-MNPs provide a Br-rich atmosphere to improve the crystallization process and compensate halide vacancies. Compared with the pristine film, the Br-MNP-mediated film exhibits an improved film morphology with enlarged vertical-oriented single grains, and possesses higher crystallinity with a reduced trap state density from 4.33 × 1015 cm−3 to 2.55 × 1015 cm−3. In addition, Br-MNPs acted as bridges between adjacent perovskite grains, which effectively accelerate carrier transport, leading to an enhanced carrier mobility of 0.210 cm2 V−1 s−1. As a result, the Br-MNP mediated perovskite photodetector exhibits an improved photoresponse with a responsivity of 3.93 A W−1, a noise level below 1.26 pA Hz−1/2, and a short response time of less than 29.9 μs. An efficient underwater wireless optical communication system equipped with this device is also demonstrated, showing huge potential of such devices in practical applications.

Graphical abstract: Macroscopic and microscopic defect management in blue/green photodetectors for underwater wireless optical communication

Supplementary files

Article information

Article type
Paper
Submitted
08 Jan 2022
Accepted
03 Mar 2022
First published
08 Mar 2022

J. Mater. Chem. C, 2022,10, 5970-5980

Macroscopic and microscopic defect management in blue/green photodetectors for underwater wireless optical communication

X. Zhou, L. Luo, Y. Huang, S. Wei, J. Zou, A. He, B. Huang, X. Li, J. Zhao, K. Shen, D. Zhao and J. Wu, J. Mater. Chem. C, 2022, 10, 5970 DOI: 10.1039/D2TC00097K

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