Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions

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Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions. / Miao, Ruijiao; Xu, Hailiang; Skripnik, Maxim; Cui, Longji; Wang, Kun; Pedersen, Kim G.L.; Leijnse, Martin; Pauly, Fabian; Wärnmark, Kenneth; Meyhofer, Edgar; Reddy, Pramod; Linke, Heiner.

In: Nano Letters, Vol. 18, No. 9, 12.09.2018, p. 5666-5672.

Research output: Contribution to journalArticle

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Miao, R, Xu, H, Skripnik, M, Cui, L, Wang, K, Pedersen, KGL, Leijnse, M, Pauly, F, Wärnmark, K, Meyhofer, E, Reddy, P & Linke, H 2018, 'Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions', Nano Letters, vol. 18, no. 9, pp. 5666-5672. https://doi.org/10.1021/acs.nanolett.8b02207

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Author

Miao, Ruijiao ; Xu, Hailiang ; Skripnik, Maxim ; Cui, Longji ; Wang, Kun ; Pedersen, Kim G.L. ; Leijnse, Martin ; Pauly, Fabian ; Wärnmark, Kenneth ; Meyhofer, Edgar ; Reddy, Pramod ; Linke, Heiner. / Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions. In: Nano Letters. 2018 ; Vol. 18, No. 9. pp. 5666-5672.

RIS

TY - JOUR

T1 - Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions

AU - Miao, Ruijiao

AU - Xu, Hailiang

AU - Skripnik, Maxim

AU - Cui, Longji

AU - Wang, Kun

AU - Pedersen, Kim G.L.

AU - Leijnse, Martin

AU - Pauly, Fabian

AU - Wärnmark, Kenneth

AU - Meyhofer, Edgar

AU - Reddy, Pramod

AU - Linke, Heiner

PY - 2018/9/12

Y1 - 2018/9/12

N2 - 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.

AB - 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.

KW - density functional theory

KW - Molecular junctions

KW - quantum interference

KW - quantum transport

KW - thermoelectricity

KW - thermopower

U2 - 10.1021/acs.nanolett.8b02207

DO - 10.1021/acs.nanolett.8b02207

M3 - Article

VL - 18

SP - 5666

EP - 5672

JO - Nano Letters

T2 - Nano Letters

JF - Nano Letters

SN - 1530-6992

IS - 9

ER -