Non-ultrawide bandgap CsPbBr3 nanosheet for sensitive deep ultraviolet photodetection

doi:10.1016/j.jmst.2023.03.032

J. Mater. Sci. Technol. ›› 2023, Vol. 159: 251-257.DOI: 10.1016/j.jmst.2023.03.032

Non-ultrawide bandgap CsPbBr₃ nanosheet for sensitive deep ultraviolet photodetection

Chun-Yan Wu^a, Yu-Xuan Le^a, Li-Yan Liang^a, Jing-Yue Li^a, Feng-Xia Liang^a, Shi-Rong Chen^a,*, Xiao-Ping Yang^a, Yu-Xue Zhou^b, Lin-Bao Luo^a,*

^aSchool of Microelectronics, Hefei University of Technology, Hefei 230009, China;
^bCollege of Physical Science and Technology, Yangzhou University, Yangzhou 225002, China

Received:2023-02-12 Revised:2023-03-22 Accepted:2023-03-22 Published:2023-10-01 Online:2023-04-26
Contact: *E-mail addresses: . srchen@hfut.edu.cn (S.-R. Chen), luolb@hfut.edu.cn (L.-B. Luo)

Abstract

Abstract: In this study, we report the fabrication of a sensitive deep ultraviolet (DUV) photodetector by using CsPbBr₃ nanosheets synthesized through confined-space growth at room temperature. The peak photoresponse of the device upon illumination blueshifts with decreasing thickness and a 68 nm CsPbBr₃ nanosheet based device displays a peak response to 265 nm illumination, showing responsivity and specific detectivity of 85 mA/W and 4.05 × 10¹¹ Jones at 3 V bias, respectively. Theoretical simulation reveals that the blueshift is associated with the wavelength-dependent absorption coefficient of CsPbBr₃ nanosheet: incident light with shorter wavelengths can be absorbed on the superficial surface, while long-wavelength light has a larger penetration depth, leading to dominant DUV absorption in thinner CsPbBr₃ nanosheet. This work will shed light on the facile and cost-effective fabrication of DUV photodetectors from non-ultrawide bandgap (UWBG) all-inorganic perovskite materials.

Key words: Non-ultrawide bandgap semiconductors, CsPbBr₃ nanosheet, Wavelength-dependent absorption coefficient, Sensitive DUV photodetector

Chun-Yan Wu, Yu-Xuan Le, Li-Yan Liang, Jing-Yue Li, Feng-Xia Liang, Shi-Rong Chen, Xiao-Ping Yang, Yu-Xue Zhou, Lin-Bao Luo. Non-ultrawide bandgap CsPbBr₃ nanosheet for sensitive deep ultraviolet photodetection[J]. J. Mater. Sci. Technol., 2023, 159: 251-257.

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Non-ultrawide bandgap CsPbBr₃ nanosheet for sensitive deep ultraviolet photodetection

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