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Highly Sensitive Low‐Bandgap Perovskite Photodetectors with Response from Ultraviolet to the Near‐Infrared Region
Author(s) -
Wang Wenbin,
Zhao Dewei,
Zhang Fujun,
Li Ludong,
Du Mingde,
Wang Changlei,
Yu Yue,
Huang Qianqian,
Zhang Miao,
Li Lingliang,
Miao Jianli,
Lou Zheng,
Shen Guozhen,
Fang Ying,
Yan Yanfa
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.201703953
Subject(s) - responsivity , materials science , perovskite (structure) , photodetector , optoelectronics , ultraviolet , specific detectivity , quantum efficiency , band gap , dark current , halide , infrared , active layer , layer (electronics) , optics , nanotechnology , thin film transistor , chemical engineering , physics , chemistry , inorganic chemistry , engineering
It is a great challenge to obtain broadband response perovskite photodetectors (PPDs) due to the relatively large bandgaps of the most used methylammonium lead halide perovskites. The response range of the reported PPDs is limited in the ultraviolet–visible range. Here, highly sensitive PPDs are successfully fabricated with low bandgap (≈1.25 eV) (FASnI 3 ) 0.6 (MAPbI 3 ) 0.4 perovskite as active layers, exhibiting a broadband response from 300 to 1000 nm. The performance of the PPDs can be optimized by adjusting the thicknesses of the perovskite and C 60 layers. The optimized PPDs with 1000 nm thick perovskite layer and 70 nm thick C 60 layer exhibit an almost flat external quantum efficiency (EQE) spectrum from 350 to 900 nm with EQE larger than 65% under −0.2 V bias. Meanwhile, the optimized PPDs also exhibit suppressed dark current of 3.9 nA, high responsivity ( R ) of over 0.4 A W −1 , high specific detectivity ( D* ) of over 10 12 Jones in the near‐infrared region under −0.2 V. Such highly sensitive broadband response PPDs, which can work well as self‐powered conditions, offer great potential applications in multicolor light detection.