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Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions

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2018

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Miao, Ruijiao
Xu, Hailiang
Cui, Longji
Wang, Kun
Pedersen, Kim G. L.
Meyhofer, Edgar
Reddy, Pramod
Linke, Heiner
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https://doi.org/10.1021/acs.nanolett.8b02207
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Nano letters. 2018, 18(9), pp. 5666-5672. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.8b02207

Zusammenfassung

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.

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530 Physik

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

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ISO 690MIAO, Ruijiao, Hailiang XU, Maxim SKRIPNIK, Longji CUI, Kun WANG, Kim G. L. PEDERSEN, Fabian PAULY, Edgar MEYHOFER, Pramod REDDY, Heiner LINKE, 2018. Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions. In: Nano letters. 2018, 18(9), pp. 5666-5672. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.8b02207
BibTex
@article{Miao2018-09-12Influ-43127,
  year={2018},
  doi={10.1021/acs.nanolett.8b02207},
  title={Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions},
  number={9},
  volume={18},
  issn={1530-6984},
  journal={Nano letters},
  pages={5666--5672},
  author={Miao, Ruijiao and Xu, Hailiang and Skripnik, Maxim and Cui, Longji and Wang, Kun and Pedersen, Kim G. L. and Pauly, Fabian and Meyhofer, Edgar and Reddy, Pramod and Linke, Heiner}
}
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