title: Monolayer graphene/germanium Schottky junction as high-performance self-driven infrared light photodetector.
abstract: We report on the simple fabrication of monolayer graphene (MLG)/germanium (Ge) heterojunction for infrared (IR) light sensing. It is found that the as-fabricated Schottky junction detector exhibits obvious photovoltaic characteristics, and is sensitive to IR light with high Ilight/Idark ratio of 2 × 10(4) at zero bias voltage. The responsivity and detectivity are as high as 51.8 mA W(-1) and 1.38 × 10(10) cm Hz(1/2) W(-1), respectively. Further photoresponse study reveals that the photovoltaic IR detector displays excellent spectral selectivity with peak sensitivity at 1400 nm, and a fast light response speed of microsecond rise/fall time with good reproducibility and long-term stability. The generality of the above results suggests that the present MLG/Ge IR photodetector would have great potential for future optoelectronic device applications.
authors.affiliation: School of Electronic Science and Applied Physics and Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, and ‡School of Materials Science and Engineering, Hefei University of Technology , Hefei, Anhui 230009, P. R. China.
authors.forename: Long-Hui
authors.initials: LH
authors.lastname: Zeng
authors.forename: Ming-Zheng
authors.initials: MZ
authors.lastname: Wang
authors.forename: Han
authors.initials: H
authors.lastname: Hu
authors.forename: Biao
authors.initials: B
authors.lastname: Nie
authors.forename: Yong-Qiang
authors.initials: YQ
authors.lastname: Yu
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Wu
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Ji-Gang
authors.initials: JG
authors.lastname: Hu
authors.forename: Chao
authors.initials: C
authors.lastname: Xie
authors.forename: Feng-Xia
authors.initials: FX
authors.lastname: Liang
authors.forename: Lin-Bao
authors.initials: LB
authors.lastname: Luo
mesh_terms: D004867:Equipment Design; D005857:Germanium / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D007259:Infrared Rays; D008027:Light; D012666:Semiconductors; D012825:Silicon / Q000737:chemistry
chemical_list: D005857:Germanium; D006108:Graphite; D012825:Silicon