A Broadband Fluorographene Photodetector

Sichao Du; Wei Lu; Ayaz Ali; Pei Zhao; Khurram Shehzad; Hongwei Guo; Lingling Ma; Xuemei Liu; Xiaodong Pi; Peng Wang; Hehai Fang; Zhen Xu; Chao Gao; Yaping Dan; Pingheng Tan; Hongtao Wang; Cheng-Te Lin; Jianyi Yang; Shurong Dong; Zhiyuan Cheng; Erping Li; Wenyan Yin; Jikui Luo; Bin Yu; Tawfique Hasan; Yang Xu; Weida Hu; Xiangfeng Duan

doi:10.1002/adma.201700463

A Broadband Fluorographene Photodetector

Adv Mater. 2017 Jun;29(22). doi: 10.1002/adma.201700463. Epub 2017 Apr 4.

Authors

Sichao Du^{1

2}, Wei Lu¹, Ayaz Ali¹, Pei Zhao³, Khurram Shehzad¹, Hongwei Guo¹, Lingling Ma¹, Xuemei Liu¹, Xiaodong Pi², Peng Wang⁴, Hehai Fang⁴, Zhen Xu⁵, Chao Gao⁵, Yaping Dan⁶, Pingheng Tan⁷, Hongtao Wang³, Cheng-Te Lin⁸, Jianyi Yang¹, Shurong Dong¹, Zhiyuan Cheng¹, Erping Li¹, Wenyan Yin¹, Jikui Luo¹, Bin Yu⁹, Tawfique Hasan¹⁰, Yang Xu^{1

2}, Weida Hu⁴, Xiangfeng Duan¹¹

Affiliations

¹ College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
² State Key Laboratory of Silicon Materials, College of Material Science, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
³ Institute of Applied Mechanics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
⁴ National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China.
⁵ MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
⁶ University of Michigan - Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, 200240, China.
⁷ State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.
⁸ 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.
⁹ College of Nanoscale Science and Engineering, State University of New York, New York, NY, 12203, USA.
¹⁰ Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
¹¹ Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USA.

PMID: 28374435
DOI: 10.1002/adma.201700463

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 sp² domains, and the trapping of photoexcited charge carriers in the localized states in sp³ domains. Tunable photoresponse is achieved by controlling the nature of sp³ sites and the size and fraction of sp³ /sp² domains. In addition, the photoresponse due to the different photoexcited-charge-carrier trapping times in sp² and sp³ nanodomains is determined. The proposed scheme paves the way toward implementing high-performance broadband graphene-based photodetectors.

Keywords: broadband; fluorographene; mid-infrared; photodetectors; ultraviolet.