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

Ting Zhang, Feng Wang, Peng Zhang, Yafei Wang, Hao Chen, Jian Li, Jiang Wu, Li Chen, Zhi David Chen, Shibin Li

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

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 CsPbBr 3 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 CsPbBr 3 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 CsPbBr 3 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 (10 3 ), 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.

Original languageEnglish
Pages (from-to)2871-2877
Number of pages7
JournalNanoscale
Volume11
Issue number6
DOIs
StatePublished - Feb 14 2019

Bibliographical note

Funding Information:
This work was supported by National Natural Science Foundation of China under Grant No. 61421002, 61874150, 61574029, and 61471085. This work was also partially supported by University of Kentucky.

Publisher Copyright:
© 2019 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • Materials Science (all)

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