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High‐Performance Photodetectors Based on Organometal Halide Perovskite Nanonets
Author(s) -
Wang Wenhui,
Ma Yurong,
Qi Limin
Publication year - 2017
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.201603653
Subject(s) - materials science , photodetector , photodetection , perovskite (structure) , crystallinity , responsivity , optoelectronics , substrate (aquarium) , halide , nanotechnology , chemical engineering , inorganic chemistry , oceanography , chemistry , engineering , composite material , geology
The booming development of organometal halide perovskites has prompted the exploration of morphology‐engineering strategies to improve their performance in optoelectronic applications. However, the preparation of optoelectronic devices of perovskites with complex architectures and desirable properties is still highly challenging. Herein, novel CH 3 NH 3 PbI 3 nanonets and nanobowl arrays are fabricated facilely by using monolayer colloidal crystal (MCC) templates on different substrates. Specifically, highly ordered CH 3 NH 3 PbI 3 nanonets with high crystallinity are fabricated on a variety of flat substrates, whereas regular CH 3 NH 3 PbI 3 nanobowl arrays are produced on a coarse substrate. The photodetection performance of the CH 3 NH 3 PbI 3 nanonet‐based photodetectors is significantly enhanced compared to the photodetectors based on conventional CH 3 NH 3 PbI 3 compact films. Particularly, the nanonet photodetectors exhibit a high responsivity (10.33 A W −1 under 700 nm monochromatic light), which is six times higher than that for the compact CH 3 NH 3 PbI 3 film devices, fast response speed, and good stability. Owing to the two‐dimensional arrayed structure, the CH 3 NH 3 PbI 3 nanonets exhibit an enhanced light harvesting ability and offer direct carrier transport pathways. Meanwhile, the MCC template brings about larger grain sizes with enhanced crystallinity. Furthermore, the perovskite nanonets can be formed on a flexible polyethylene terephthalate substrate for the fabrication of promising flexible nanonet photodetectors.