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Flexible and Self‐Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI 3 –CsPbBr 3 Heterojunction Nanowire Array
Author(s) -
Wang Meng,
Tian Wei,
Cao Fengren,
Wang Min,
Li Liang
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201909771
Subject(s) - materials science , responsivity , nanowire , heterojunction , optoelectronics , photodetector , perovskite (structure) , nanowire battery , electrode , photodetection , fabrication , polyethylene naphthalate , nanotechnology , layer (electronics) , chemical engineering , engineering , medicine , chemistry , alternative medicine , anode , pathology , lithium vanadium phosphate battery
Self‐powered perovskite photodetectors mainly adopt the vertical heterojunction structure composed of active layer, electron–hole transfer layers, and electrodes, which results in the loss of incident light and interfacial accumulation of defects. To address these issues, a self‐powered lateral photodetector based on CsPbI 3 –CsPbBr 3 heterojunction nanowire arrays is designed on both a rigid glass and a flexible polyethylene naphthalate substrate using an in situ conversion and mask‐assisted electrode fabrication method. Through adding the polyvinyl pyrrolidone and optimizing the concentration of precursors under the pressure‐assisted moulding process, both the crystallinity and stability of perovskite nanowire array are improved. The nanowire array–based lateral device shows a high responsivity of 125 mA W −1 and a fast rise and decay time of 0.7 and 0.8 ms under a self‐powered operation condition. This work provides a new strategy to fabricate perovskite heterojunction nanoarrays towards self‐powered photodetection.