High-responsivity graphene/InAs nanowire heterojunction near-infrared photodetectors with distinct photocurrent on/off ratios

Jinshui Miao, Weida Hu, Nan Guo, Zhenyu Lu, Xingqiang Liu, Lei Liao, Pingping Chen, Tao Jiang, Shiwei Wu, Johnny C. Ho, Lin Wang, Xiaoshuang Chen, Wei Lu

Research output: Contribution to journalArticlepeer-review

130 Citations (Scopus)

Abstract

Graphene is a promising candidate material for high-speed and ultra-broadband photodetectors. However, graphene-based photodetectors suffer from low photoreponsivity and Ilight/Idark ratios due to their negligible-gap nature and small optical absorption. Here, a new type of graphene/InAs nanowire (NW) vertically stacked heterojunction infrared photodetector is reported, with a large photoresponsivity of 0.5 AW-1 and Ilight/Idark ratio of 5 × 102, while the photoresponsivity and I light/Idark ratio of graphene infrared photodetectors are 0.1 mAW-1 and 1, respectively. The Fermi level (EF) of graphene can be widely tuned by the gate voltage owing to its 2D nature. As a result, the back-gated bias can modulate the Schottky barrier (SB) height at the interface between graphene and InAs NWs. Simulations further demonstrate the rectification behavior of graphene/InAs NW heterojunctions and the tunable SB controls charge transport across the vertically stacked heterostructure. The results address key challenges for graphene-based infrared detectors, and are promising for the development of graphene electronic and optoelectronic applications.

Original languageEnglish
Pages (from-to)936-942
Number of pages7
JournalSmall
Volume11
Issue number8
DOIs
Publication statusPublished - Feb 25 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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