Issue 6, 2019

Low-temperature processed inorganic perovskites for flexible detectors with a broadband photoresponse

Abstract

Flexible photodetectors (PDs) have become a research hotspot due to their potential applications in foldable displays, wearable optoelectronic devices, and implantable biomedical sensors. Inorganic CsPbBr3 perovskites, an emerging class of stable metal halide perovskites, have been explored as photoactive materials in PDs due to their superior photoelectrical properties and simple processing. The reported temperature for the fabrication of high-quality CsPbBr3 films is usually higher than 150 °C, which hinders their application in flexible devices. Here, for the first time, high-performance flexible PDs based on CsPbBr3 perovskite films, which showed a broadband spectrum response from blind ultraviolet to visible light, were realized via a modified low-temperature (70 °C) solution-processed method. The perovskite films prepared by this method exhibited improved morphology and high light-harvesting capability. The device also yielded high ON/OFF ratio (103), fast response speed (260 ms, rise time) and high responsivity (0.24 mA W−1) for solar-blind UV light (254 nm) at 2 V. Moreover, the photodetector exhibited outstanding mechanical flexibility and long-term environmental stability for two months without encapsulation. Our work paves the way for the realization of cost-efficient high-performance flexible optoelectronic devices.

Graphical abstract: Low-temperature processed inorganic perovskites for flexible detectors with a broadband photoresponse

Supplementary files

Article information

Article type
Paper
Submitted
07 Dec 2018
Accepted
12 Jan 2019
First published
15 Jan 2019

Nanoscale, 2019,11, 2871-2877

Low-temperature processed inorganic perovskites for flexible detectors with a broadband photoresponse

T. Zhang, F. Wang, P. Zhang, Y. Wang, H. Chen, J. Li, J. Wu, L. Chen, Z. D. Chen and S. Li, Nanoscale, 2019, 11, 2871 DOI: 10.1039/C8NR09900F

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