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An Electrically Modulated Single‐Color/Dual‐Color Imaging Photodetector
Author(s) -
Li Lin,
Chen Hongyu,
Fang Zhimin,
Meng Xianyi,
Zuo Chuantian,
Lv Menglan,
Tian Yongzhi,
Fang Ying,
Xiao Zuo,
Shan Chongxin,
Xiao Zhengguo,
Jin Zhiwen,
Shen Guozhen,
Shen Liang,
Ding Liming
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201907257
Subject(s) - photodetection , photodetector , materials science , responsivity , optoelectronics , optics , wavelength , physics
An electrically modulated single‐/dual‐color imaging photodetector with fast response speed is developed based on a small molecule (CO i 8DFIC)/perovskite (CH 3 NH 3 PbBr 3 ) hybrid film. Owing to the type‐I heterojunction, the device can facilely transform dual‐color images to single‐color images by applying a small bias voltage. The photodetector exhibits two distinct cut‐off wavelengths at ≈544 nm (visible region) and ≈920 nm (near‐infrared region), respectively, without any power supply. Its two peak responsivities are 0.16 A W −1 at ≈525 nm and 0.041 A W −1 at ≈860 nm with a fast response speed (≈10 2 ns). Under 0.6 V bias, the photodetector can operate in a single‐color mode with a peak responsivity of 0.09 A W −1 at ≈475 nm, showing a fast response speed (≈10 2 ns). A physical model based on band energy theory is developed to illustrate the origin of the tunable single‐/dual‐color photodetection. This work will stimulate new approaches for developing solution‐processed multifunctional photodetectors for imaging photodetection in complex circumstances.