Enhanced LWIR response of InP/InAsP quantum discs-in-nanowire array photodetectors by photogating and ultra-thin ITO contacts

Research output: Contribution to journalArticlepeer-review

Abstract

Here we report on an experimental and theoretical investigation of the long-wavelength infrared (LWIR) photoresponse of photodetectors based on arrays of three million InP nanowires with axially embedded InAsP quantum discs. An ultra-thin top indium tin oxide contact combined with a novel photogating mechanism facilitates an improved LWIR normal incidence sensitivity in contrast to traditional planar quantum well photodetectors. The electronic structure of the quantum discs, including strain and defect-induced photogating effects, and optical transition matrix elements were calculated by an 8-band k·p simulation along with solving drift-diffusion equations to unravel the physics behind the generation of narrow linewidth intersubband signals observed from the quantum discs.

Original languageEnglish
Article number215206
JournalNanotechnology
Volume35
Issue number21
DOIs
Publication statusPublished - 2024 May 20

Subject classification (UKÄ)

  • Condensed Matter Physics

Free keywords

  • infrared photodetectors
  • long-wavelength infrared (LWIR)
  • nanowire array photodetectors
  • nanowires
  • photogating
  • quantum discs-in-nanowires
  • ultra-thin ITO contacts

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