title: A Broadband Fluorographene Photodetector.
abstract: High-performance photodetectors operating over a broad wavelength range from ultraviolet, visible, to infrared are of scientific and technological importance for a wide range of applications. Here, a photodetector based on van der Waals heterostructures of graphene and its fluorine-functionalized derivative is presented. It consistently shows broadband photoresponse from the ultraviolet (255 nm) to the mid-infrared (4.3 µm) wavelengths, with three orders of magnitude enhanced responsivity compared to pristine graphene photodetectors. The broadband photodetection is attributed to the synergistic effects of the spatial nonuniform collective quantum confinement of sp2domains, and the trapping of photoexcited charge carriers in the localized states in sp3domains. Tunable photoresponse is achieved by controlling the nature of sp3sites and the size and fraction of sp3/sp2domains. In addition, the photoresponse due to the different photoexcited-charge-carrier trapping times in sp2and sp3nanodomains is determined. The proposed scheme paves the way toward implementing high-performance broadband graphene-based photodetectors.
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.|State Key Laboratory of Silicon Materials, College of Material Science, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Sichao
authors.initials: S
authors.lastname: Du
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Ayaz
authors.initials: A
authors.lastname: Ali
authors.affiliation: Institute of Applied Mechanics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Pei
authors.initials: P
authors.lastname: Zhao
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Khurram
authors.initials: K
authors.lastname: Shehzad
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Guo
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Lingling
authors.initials: L
authors.lastname: Ma
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Silicon Materials, College of Material Science, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Pi
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China.
authors.forename: Hehai
authors.initials: H
authors.lastname: Fang
authors.affiliation: MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Xu
authors.affiliation: MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Gao
authors.affiliation: University of Michigan - Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Dan
authors.affiliation: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.
authors.forename: Pingheng
authors.initials: P
authors.lastname: Tan
authors.affiliation: Institute of Applied Mechanics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Hongtao
authors.initials: H
authors.lastname: Wang
authors.affiliation: Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China.
authors.forename: Cheng-Te
authors.initials: CT
authors.lastname: Lin
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Jianyi
authors.initials: J
authors.lastname: Yang
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Shurong
authors.initials: S
authors.lastname: Dong
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Cheng
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Erping
authors.initials: E
authors.lastname: Li
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Wenyan
authors.initials: W
authors.lastname: Yin
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Jikui
authors.initials: J
authors.lastname: Luo
authors.affiliation: College of Nanoscale Science and Engineering, State University of New York, New York, NY, 12203, USA.
authors.forename: Bin
authors.initials: B
authors.lastname: Yu
authors.affiliation: Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
authors.forename: Tawfique
authors.initials: T
authors.lastname: Hasan
authors.affiliation: College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.|State Key Laboratory of Silicon Materials, College of Material Science, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Xu
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China.
authors.forename: Weida
authors.initials: W
authors.lastname: Hu
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USA.
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Duan
keywords: broadband; fluorographene; mid-infrared; photodetectors; ultraviolet