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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

Single-nanowire, low-bandgap hot carrier solar cells with tunable open-circuit voltage

Author

  • Steven Limpert
  • Adam Burke
  • I. Ju Chen
  • Nicklas Anttu
  • Sebastian Lehmann
  • Sofia Fahlvik Svensson
  • Stephen Bremner
  • Gavin Conibeer
  • Claes Thelander
  • Mats Erik Pistol
  • Heiner Linke

Summary, in English

Compared to traditional pn-junction photovoltaics, hot carrier solar cells offer potentially higher efficiency by extracting work from the kinetic energy of photogenerated 'hot carriers' before they cool to the lattice temperature. Hot carrier solar cells have been demonstrated in high-bandgap ferroelectric insulators and GaAs/AlGaAs heterostructures, but so far not in low-bandgap materials, where the potential efficiency gain is highest. Recently, a high open-circuit voltage was demonstrated in an illuminated wurtzite InAs nanowire with a low bandgap of 0.39 eV, and was interpreted in terms of a photothermoelectric effect. Here, we point out that this device is a hot carrier solar cell and discuss its performance in those terms. In the demonstrated devices, InP heterostructures are used as energy filters in order to thermoelectrically harvest the energy of hot electrons photogenerated in InAs absorber segments. The obtained photovoltage depends on the heterostructure design of the energy filter and is therefore tunable. By using a high-resistance, thermionic barrier, an open-circuit voltage is obtained that is in excess of the Shockley-Queisser limit. These results provide generalizable insight into how to realize high voltage hot carrier solar cells in low-bandgap materials, and therefore are a step towards the demonstration of higher efficiency hot carrier solar cells.

Department/s

  • Solid State Physics
  • NanoLund

Publishing year

2017-10-02

Language

English

Publication/Series

Nanotechnology

Volume

28

Issue

43

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Energy Engineering
  • Nano Technology

Keywords

  • hot carriers
  • III-V nanowires
  • photothermoelectrics
  • photovoltaics
  • Shockley-Queisser limit

Status

Published

ISBN/ISSN/Other

  • ISSN: 0957-4484