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TiO 2 Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors
Author(s) -
Yi Xiaohui,
Ren Zhenwei,
Chen Ningli,
Li Cheng,
Zhong Xinhua,
Yang Shiyong,
Wang Jizheng
Publication year - 2017
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201700251
Subject(s) - photodetector , materials science , perovskite (structure) , nanocrystal , optoelectronics , bilayer , halide , graphene , substrate (aquarium) , photovoltaic system , nanotechnology , chemical engineering , inorganic chemistry , electrical engineering , chemistry , oceanography , membrane , biology , geology , engineering , genetics
Owing to their attractive performance in photovoltaic devices, organolead halide perovskite materials have attracted enormous interest for photodetector applications. However, current perovskite‐based photodetectors mainly rely on high‐conductive 2D materials such as graphene or transition metal sulfides to transport photocarriers, which indeed significantly improve the photoresponsivity but seriously weaken other parameters such as on/off ratio or response speed. Achieving a high overall performance remains a challenge. Here, a solution‐processed TiO 2 nanocrystal (NC) film is employed to transport photocarriers. The designed TiO 2 NC/perovskite (CH 3 NH 3 PbI 3 ) bilayer device exhibits satisfactory overall performance with on/off ratio of 4000, photodetectivity of 1.85 × 10 12 Jones, and rise/decay time of 0.49/0.56 s. The device can also be integrated on flexible polyimide substrate. This work provides a strategy to realize high‐performance perovskite‐based photodetectors and clearly demonstrates their potential applications in future flexible optoelectronics.