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Dual‐Phase CsPbBr 3 –CsPb 2 Br 5 Perovskite Thin Films via Vapor Deposition for High‐Performance Rigid and Flexible Photodetectors
Author(s) -
Tong Guoqing,
Li Huan,
Li Danting,
Zhu Zhifeng,
Xu Enze,
Li Guopeng,
Yu Linwei,
Xu Jun,
Jiang Yang
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201702523
Subject(s) - materials science , photocurrent , photodetector , perovskite (structure) , passivation , responsivity , optoelectronics , tetragonal crystal system , thin film , band gap , chemical vapor deposition , specific detectivity , phase (matter) , nanotechnology , layer (electronics) , chemical engineering , chemistry , organic chemistry , engineering
Abstract Inorganic perovskites with special semiconducting properties and structures have attracted great attention and are regarded as next generation candidates for optoelectronic devices. Herein, using a physical vapor deposition process with a controlled excess of PbBr 2 , dual‐phase all‐inorganic perovskite composite CsPbBr 3 –CsPb 2 Br 5 thin films are prepared as light‐harvesting layers and incorporated in a photodetector (PD). The PD has a high responsivity and detectivity of 0.375 A W −1 and 10 11 Jones, respectively, and a fast response time (from 10% to 90% of the maximum photocurrent) of ≈280 µs/640 µs. The device also shows an excellent stability in air for more than 65 d without encapsulation. Tetragonal CsPb 2 Br 5 provides satisfactory passivation to reduce the recombination of the charge carriers, and with its lower free energy, it enhances the stability of the inorganic perovskite devices. Remarkably, the same inorganic perovskite photodetector is also highly flexible and exhibits an exceptional bending performance (>1000 cycles). These results highlight the great potential of dual‐phase inorganic perovskite films in the development of optoelectronic devices, especially for flexible device applications.