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Portrait of Heiner Linke; Photo: Kennet Ruona

Heiner Linke

Professor, Deputy dean at Faculty of Engineering, LTH

Portrait of Heiner Linke; Photo: Kennet Ruona

Nanowire photodetectors with embedded quantum heterostructures for infrared detection

Author

  • Mohammad Karimi
  • Magnus Heurlin
  • Steven Limpert
  • Vishal Jain
  • Ebrahim Mansouri
  • Xulu Zeng
  • Lars Samuelson
  • Heiner Linke
  • Magnus Borgström
  • Håkan Pettersson

Summary, in English

Nanowires offer remarkable opportunities for realizing new optoelectronic devices because of their unique fundamental properties. The ability to engineer nanowire heterostructures with large bandgap variations is particularly interesting for technologically important broadband photodetector applications. Here we report on infrared photodetectors based on arrays of InP nanowires with embedded InAsP quantum discs. We demonstrate a strongly reduced dark current in the detector elements by compensating the unintentional n-doping in the nominal intrinsic region of the InP nanowires by in-situ doping with Zn, a crucial step towards realizing high-performance devices. The optimized array detectors show a broad spectral sensitivity at normal incidence for wavelengths from visible to far-infrared up to 20 μm, promoted by both interband and intersubband transitions. Optical simulations show that the unexpected normal incidence response at long wavelengths is due to non-zero longitudinal modes hosted by the nanowires.

Department/s

  • Solid State Physics
  • NanoLund

Publishing year

2019

Language

English

Pages

209-212

Publication/Series

Infrared Physics and Technology

Volume

96

Document type

Journal article

Publisher

Elsevier

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1350-4495