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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

Hot-carrier separation in heterostructure nanowires observed by electron-beam induced current

Author

  • Jonatan Fast
  • Enrique Barrigon
  • Mukesh Kumar
  • Yang Chen
  • Lars Samuelson
  • Magnus Borgström
  • Anders Gustafsson
  • Steven Limpert
  • Adam Burke
  • Heiner Linke

Summary, in English

The separation of hot carriers in semiconductors is of interest for applications such asthermovoltaic photodetection and third-generation photovoltaics. Semiconductor nanowiresoffer several potential advantages for effective hot-carrier separation such as: a high degree ofcontrol and flexibility in heterostructure-based band engineering, increased hot-carriertemperatures compared to bulk, and a geometry well suited for local control of light absorption.Indeed, InAs nanowires with a short InP energy barrier have been observed to produce electricpower under global illumination, with an open-circuit voltage exceeding the Shockley-Queisserlimit. To understand this behaviour in more detail, it is necessary to establish control over theprecise location of electron-hole pair-generation in the nanowire. In this work we performelectron-beam induced current measurements with high spatial resolution, and demonstrate therole of the InP barrier in extracting energetic electrons.We interprete the results in terms ofhot-carrier separation, and extract estimates of the hot carriers’ mean free path.

Department/s

  • NanoLund
  • Solid State Physics

Publishing year

2020-07-10

Language

English

Publication/Series

Nanotechnology

Volume

31

Issue

39

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Physical Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 1361-6528