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Shape‐ and Trap‐Controlled Nanocrystals for Giant‐Performance Improvement of All‐Inorganic Perovskite Photodetectors
Author(s) -
Pang Liuqing,
Yao Yao,
Wang Qian,
Zhang Xisheng,
Jin Zhiwen,
Liu Shengzhong Frank
Publication year - 2018
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201700363
Subject(s) - passivation , photodetector , materials science , perovskite (structure) , nanocrystal , optoelectronics , absorption (acoustics) , nanowire , nanotechnology , layer (electronics) , chemistry , composite material , crystallography
In the last few years, all‐inorganic perovskite CsPbBr 3 nanocrystals (NCs) have attracted tremendous attention for its high carrier mobility, long carrier diffusion length, excellent visible light absorption, and more importantly superior air stability. In fact, photodetectors (PDs) are designed and fabricated using the CsPbBr 3 NCs with very high performance. Herein, by optimizing the NC shape, size, and surface passivation, the CsPbBr 3 PDs are developed with an even higher performance. It is found that the PDs based on CsPbBr 3 nanoribbons show the best photoresponse among all common NC structures synthesized. Moreover, it is found that 6,6‐phenyl‐C61‐butyric acid ethyl ester can be used to passivate defects on the CsPbBr 3 nanoribbon surface and shows the charge transfer. As a result, the device displays superior photoresponsivity ( R = 18.4 A W −1 ), excellent signal‐to‐noise ratio, as high as 10 4 , and a very sharp rise/decay time (8.7/3.5 ms). The method demonstrated may offer an attractive strategy to improve sensitivity for all‐inorganic perovskite PDs in general.