Solution-Processed Inorganic Perovskite Flexible Photodetectors with High Performance

Ziji Liu; Hao Li; Chaojie Qin; Ting Zhang; Yiding Gu; Hao Chen; Hualin Zheng; Shibin Li

doi:10.1186/s11671-019-3120-x

Solution-Processed Inorganic Perovskite Flexible Photodetectors with High Performance

Nanoscale Res Lett. 2019 Aug 17;14(1):284. doi: 10.1186/s11671-019-3120-x.

Authors

Ziji Liu¹, Hao Li¹, Chaojie Qin¹, Ting Zhang¹, Yiding Gu¹, Hao Chen¹, Hualin Zheng¹, Shibin Li²

Affiliations

¹ State Key Laboratory of Electronic Thin Films and Integrated Devices, and School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, Sichuan, China.
² State Key Laboratory of Electronic Thin Films and Integrated Devices, and School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, Sichuan, China. shibinli@uestc.edu.cn.

Abstract

All inorganic CsPbI_3-xBr_x perovskites have been widely used in photodetectors due to their excellent optoelectronic properties and simple preparation processes. Here, high-performance flexible photodetectors based on inorganic CsPbI_3-xBr_x perovskites are demonstrated, which are achieved by a modified solution-processed method. When biased at a low voltage of 10 mV, the device yielded fast response speeds (90 μs /110 μs for CsPbI₂Br PDs and 100 μs/140 μs for CsPbIBr₂ PDs), a high on/off ratio of 10⁴, and a high detectivity about 10¹² Jones. Meanwhile, the devices showed outstanding environmental stability and mechanical flexibility. The periodic I-t curves had negligible fluctuation (< 5%) after storing in air atmosphere for 30 days or bending for 100 times. The results indicate that CsPbI_3-xBr_x perovskites have great potential in photodetection areas and pave the way to achieve high-performance flexible PDs.

Keywords: CsPbI3-xBrx-based flexible PDs; Environmental stability; Low bias voltage; Mechanical flexibility.

Abstract

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