Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions
(2018) In Nano Letters 18(9). p.5666-5672- Abstract
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,... (More)
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.
(Less)
- author
- organization
- publishing date
- 2018-09-12
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- density functional theory, Molecular junctions, quantum interference, quantum transport, thermoelectricity, thermopower
- in
- Nano Letters
- volume
- 18
- issue
- 9
- pages
- 7 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:30084643
- scopus:85052336534
- ISSN
- 1530-6984
- DOI
- 10.1021/acs.nanolett.8b02207
- language
- English
- LU publication?
- yes
- id
- 82417495-b72f-48d6-89e5-5d5ff4b3e3fb
- date added to LUP
- 2019-02-10 16:45:17
- date last changed
- 2024-09-18 13:12:32
@article{82417495-b72f-48d6-89e5-5d5ff4b3e3fb, abstract = {{<p>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.</p>}}, author = {{Miao, Ruijiao and Xu, Hailiang and Skripnik, Maxim and Cui, Longji and Wang, Kun and Pedersen, Kim G.L. and Leijnse, Martin and Pauly, Fabian and Wärnmark, Kenneth and Meyhofer, Edgar and Reddy, Pramod and Linke, Heiner}}, issn = {{1530-6984}}, keywords = {{density functional theory; Molecular junctions; quantum interference; quantum transport; thermoelectricity; thermopower}}, language = {{eng}}, month = {{09}}, number = {{9}}, pages = {{5666--5672}}, publisher = {{The American Chemical Society (ACS)}}, series = {{Nano Letters}}, title = {{Influence of Quantum Interference on the Thermoelectric Properties of Molecular Junctions}}, url = {{http://dx.doi.org/10.1021/acs.nanolett.8b02207}}, doi = {{10.1021/acs.nanolett.8b02207}}, volume = {{18}}, year = {{2018}}, }