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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

Thermoelectric Power Factor Limit of a 1D Nanowire

Author

  • I. Ju Chen
  • Adam Burke
  • Artis Svilans
  • Heiner Linke
  • Claes Thelander

Summary, in English

In the past decade, there has been significant interest in the potentially advantageous thermoelectric properties of one-dimensional (1D) nanowires, but it has been challenging to find high thermoelectric power factors based on 1D effects in practice. Here we point out that there is an upper limit to the thermoelectric power factor of nonballistic 1D nanowires, as a consequence of the recently established quantum bound of thermoelectric power output. We experimentally test this limit in quasiballistic InAs nanowires by extracting the maximum power factor of the first 1D subband through I-V characterization, finding that the measured maximum power factors conform to the theoretical limit. The established limit allows the prediction of the achievable power factor of a specific nanowire material system with 1D electronic transport based on the nanowire dimension and mean free path. The power factor of state-of-the-art semiconductor nanowires with small cross section and high crystal quality can be expected to be highly competitive (on the order of mW/m K2) at low temperatures. However, they have no clear advantage over bulk materials at, or above, room temperature.

Department/s

  • Solid State Physics
  • NanoLund

Publishing year

2018-04-24

Language

English

Publication/Series

Physical Review Letters

Volume

120

Issue

17

Document type

Journal article

Publisher

American Physical Society

Topic

  • Nano Technology

Status

Published

ISBN/ISSN/Other

  • ISSN: 0031-9007