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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

Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions

Author

  • Ruijiao Miao
  • Hailiang Xu
  • Maxim Skripnik
  • Longji Cui
  • Kun Wang
  • Kim G.L. Pedersen
  • Martin Leijnse
  • Fabian Pauly
  • Kenneth Wärnmark
  • Edgar Meyhofer
  • Pramod Reddy
  • Heiner Linke

Summary, in English

Molecular junctions offer unique opportunities for controlling charge transport on the atomic scale and for studying energy conversion. For example, quantum interference effects in molecular junctions have been proposed as an avenue for highly efficient thermoelectric power conversion at room temperature. Toward this goal, we investigated the effect of quantum interference on the thermoelectric properties of molecular junctions. Specifically, we employed oligo(phenylene ethynylene) (OPE) derivatives with a para-connected central phenyl ring (para-OPE3) and meta-connected central ring (meta-OPE3), which both covalently bind to gold via sulfur anchoring atoms located at their ends. In agreement with predictions from ab initio modeling, our experiments on both single molecules and monolayers show that meta-OPE3 junctions, which are expected to exhibit destructive interference effects, yield a higher thermopower (with ∼20 μV/K) compared with para-OPE3 (with ∼10 μV/K). Our results show that quantum interference effects can indeed be employed to enhance the thermoelectric properties of molecular junctions.

Department/s

  • NanoLund
  • Centre for Analysis and Synthesis
  • Department of Mechanical Engineering Sciences

Publishing year

2018-09-12

Language

English

Pages

5666-5672

Publication/Series

Nano Letters

Volume

18

Issue

9

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Theoretical Chemistry
  • Atom and Molecular Physics and Optics

Keywords

  • density functional theory
  • Molecular junctions
  • quantum interference
  • quantum transport
  • thermoelectricity
  • thermopower

Status

Published

ISBN/ISSN/Other

  • ISSN: 1530-6984