Author(s): Li, L (Li, Lin); Chen, HY (Chen, Hongyu); Fang, ZM (Fang, Zhimin); Meng, XY (Meng, Xianyi); Zuo, CT (Zuo, Chuantian); Lv, ML (Lv, Menglan); Tian, YZ (Tian, Yongzhi); Fang, Y (Fang, Ying); Xiao, Z (Xiao, Zuo); Shan, CX (Shan, Chongxin); Xiao, ZG (Xiao, Zhengguo); Jin, ZW (Jin, Zhiwen); Shen, GZ (Shen, Guozhen); Shen, L (Shen, Liang); Ding, LM (Ding, Liming)

Source: ADVANCED MATERIALS Article Number: 1907257 DOI: 10.1002/adma.201907257 Early Access Date: MAY 2020

Abstract: An electrically modulated single-/dual-color imaging photodetector with fast response speed is developed based on a small molecule (CO(i)8DFIC)/perovskite (CH3NH3PbBr3) 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 approximate to 544 nm (visible region) and approximate to 920 nm (near-infrared region), respectively, without any power supply. Its two peak responsivities are 0.16 A W-1 at approximate to 525 nm and 0.041 A W-1 at approximate to 860 nm with a fast response speed (approximate to 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 approximate to 475 nm, showing a fast response speed (approximate to 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.

Accession Number: WOS:000531270900001

PubMed ID: 32383310

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Jin, Zhiwen         L-2907-2013         0000-0002-5256-9106

ISSN: 0935-9648

eISSN: 1521-4095

Full Text: https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201907257