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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 Extraction in Nanowire-Nanoantenna Photovoltaic Devices

Author

  • I. Ju Chen
  • Steven Limpert
  • Wondwosen Metaferia
  • Claes Thelander
  • Lars Samuelson
  • Federico Capasso
  • Adam M. Burke
  • Heiner Linke

Summary, in English

Nanowires bring new possibilities to the field of hot-carrier photovoltaics by providing flexibility in combining materials for band engineering and using nanophotonic effects to control light absorption. Previously, an open-circuit voltage beyond the Shockley-Queisser limit was demonstrated in hot-carrier devices based on InAs-InP-InAs nanowire heterostructures. However, in these first experiments, the location of light absorption, and therefore the precise mechanism of hot-carrier extraction, was uncontrolled. In this Letter, we combine plasmonic nanoantennas with InAs-InP-InAs nanowire devices to enhance light absorption within a subwavelength region near an InP energy barrier that serves as an energy filter. From photon-energy- and irradiance-dependent photocurrent and photovoltage measurements, we find that photocurrent generation is dominated by internal photoemission of nonthermalized hot electrons when the photoexcited electron energy is above the barrier and by photothermionic emission when the energy is below the barrier. We estimate that an internal quantum efficiency up to 0.5-1.2% is achieved. Insights from this study provide guidelines to improve internal quantum efficiencies based on nanowire heterostructures.

Department/s

  • Solid State Physics
  • NanoLund

Publishing year

2020

Language

English

Pages

4064-4072

Publication/Series

Nano Letters

Volume

20

Issue

6

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Nano Technology

Keywords

  • Hot electron
  • III−V nanowire heterostructure
  • internal photoemission
  • photothermionic
  • plasmonic
  • solar energy conversion

Status

Published

ISBN/ISSN/Other

  • ISSN: 1530-6992