An Electrically Modulated Single-Color/Dual-Color Imaging Photodetector

Lin Li; Hongyu Chen; Zhimin Fang; Xianyi Meng; Chuantian Zuo; Menglan Lv; Yongzhi Tian; Ying Fang; Zuo Xiao; Chongxin Shan; Zhengguo Xiao; Zhiwen Jin; Guozhen Shen; Liang Shen; Liming Ding

doi:10.1002/adma.201907257

An Electrically Modulated Single-Color/Dual-Color Imaging Photodetector

Adv Mater. 2020 Jun;32(24):e1907257. doi: 10.1002/adma.201907257. Epub 2020 May 7.

Authors

Lin Li^{1

2}, Hongyu Chen³, Zhimin Fang², Xianyi Meng², Chuantian Zuo⁴, Menglan Lv⁵, Yongzhi Tian⁶, Ying Fang², Zuo Xiao², Chongxin Shan⁶, Zhengguo Xiao⁷, Zhiwen Jin⁸, Guozhen Shen⁹, Liang Shen¹⁰, Liming Ding²

Affiliations

¹ Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150025, China.
² Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190, China.
³ Department of Physics, Harbin Institute of Technology, Harbin, 150080, China.
⁴ CSIRO Manufacturing, Bag 10, Clayton South, VIC, 3169, Australia.
⁵ School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China.
⁶ School of Physics and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
⁷ Department of Physics, Key Laboratory of Strongly-Coupled Quantum Matter Physics (CAS), University of Science and Technology of China, Hefei, 230026, China.
⁸ School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China.
⁹ State Key Laboratory for Superlattice and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.
¹⁰ State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.

PMID: 32383310
DOI: 10.1002/adma.201907257

Abstract

An electrically modulated single-/dual-color imaging photodetector with fast response speed is developed based on a small molecule (CO_i 8DFIC)/perovskite (CH₃ NH₃ PbBr₃ ) 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 (≈10² 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 (≈10² 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.

Keywords: dual-color imaging; organic/perovskite photodetectors; response speed.

Abstract

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