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Flexible and Self‐Powered Photodetector Arrays Based on All‐Inorganic CsPbBr 3 Quantum Dots
Author(s) -
Shen Kai,
Xu Hao,
Li Xiao,
Guo Jian,
Sathasivam Sanjayan,
Wang Mingqing,
Ren Aobo,
Choy Kwang Leong,
Parkin Ivan P.,
Guo Zhengxiao,
Wu Jiang
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202000004
Subject(s) - materials science , photodetector , responsivity , optoelectronics , quantum dot , perovskite (structure) , photoluminescence , quantum efficiency , detector , specific detectivity , crystallinity , nanotechnology , optics , physics , composite material , chemical engineering , engineering
Abstract Flexible devices are garnering substantial interest owing to their potential for wearable and portable applications. Here, flexible and self‐powered photodetector arrays based on all‐inorganic perovskite quantum dots (QDs) are reported. CsBr/KBr‐mediated CsPbBr 3 QDs possess improved surface morphology and crystallinity with reduced defect densities, in comparison with the pristine ones. Systematic material characterizations reveal enhanced carrier transport, photoluminescence efficiency, and carrier lifetime of the CsBr/KBr‐mediated CsPbBr 3 QDs. Flexible photodetector arrays fabricated with an optimum CsBr/KBr treatment demonstrate a high open‐circuit voltage of 1.3 V, responsivity of 10.1 A W −1 , specific detectivity of 9.35 × 10 13 Jones, and on/off ratio up to ≈10 4 . Particularly, such performance is achieved under the self‐powered operation mode. Furthermore, outstanding flexibility and electrical stability with negligible degradation after 1600 bending cycles (up to 60°) are demonstrated. More importantly, the flexible detector arrays exhibit uniform photoresponse distribution, which is of much significance for practical imaging systems, and thus promotes the practical deployment of perovskite products.