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Ultrastable Lead‐Free Double Perovskite Photodetectors with Imaging Capability
Author(s) -
Li Ying,
Shi Zhifeng,
Lei Lingzhi,
Li Sen,
Yang Dongwen,
Wu Di,
Xu Tingting,
Tian Yongzhi,
Lu Yingjie,
Wang Ye,
Zhang Lijun,
Li Xinjian,
Zhang Yuantao,
Du Guotong,
Shan Chongxin
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201900188
Subject(s) - photodetector , photodetection , materials science , perovskite (structure) , optoelectronics , halide , chemical engineering , engineering , inorganic chemistry , chemistry
Recently, the halide perovskites have increasingly received attention because of their superior capabilities in photodetector applications. However, the well‐known instability and lead‐toxicity are two major obstacles for their commercialization and practical applications. In this work, self‐powered photodetectors based on solution‐processed double perovskite Cs 2 AgBiBr 6 films are fabricated for the first time. Owing to the high material integrity of Cs 2 AgBiBr 6 and efficient interfacial charge transfer from perovskite to the underlying electron‐quenching layer, the photodetector demonstrates excellent performances. Especially, the unencapsulated device demonstrates a good working stability in the open air. Typically it has the ability to endure a high temperature of 373 K for 10 h continuous running, demonstrating a good temperature resistance. In addition, after 3‐month storage in open air, the photodetection capability of the device can almost be maintained. By deploying the photodetector as a point‐like sensing pixel, high‐resolution imaging patterns are acquired, which is the first report on imaging applications of lead‐free perovskite photodetectors. The obtained results suggest that the lead‐free double perovskite Cs 2 AgBiBr 6 is potentially an attractive candidate to be applied in high‐efficiency and stable photodetectors that can be employed in optical imaging.