Hang Chen
Exploring the thermoelectric properties of oligo(phenylene-ethynylene) derivatives
Chen, Hang; Sangtarash, Sara; Li, Guopeng; Gantenbein, Markus; Cao, Wenqiang; Alqorashi, Afaf; Liu, Junyang; Zhang, Chunquan; Zhang, Yulong; Chen, Lijue; Chen, Yaorong; Olsen, Gunnar; Sadeghi, Hatef; Bryce, Martin R.; Lambert, Colin J.; Hong, Wenjing
Authors
Sara Sangtarash
Guopeng Li
Markus Gantenbein
Wenqiang Cao
Afaf Alqorashi
Junyang Liu
Chunquan Zhang
Yulong Zhang
Lijue Chen
Yaorong Chen
Gunnar Olsen
Hatef Sadeghi
Professor Martin Bryce m.r.bryce@durham.ac.uk
Professor
Colin J. Lambert
Wenjing Hong
Abstract
Seebeck coefficient measurements provide unique insights into the electronic structure of single-molecule junctions, which underpins their charge and heat transport properties. Since the Seebeck coefficient depends on the slope of the transmission function at the Fermi energy (EF), the sign of the thermoelectric voltage will be determined by the location of the molecular orbital levels relative to EF. Here we investigate thermoelectricity in molecular junctions formed from a series of oligophenylene-ethynylene (OPE) derivatives with biphenylene, naphthalene and anthracene cores and pyridyl or methylthio end-groups. Single-molecule conductance and thermoelectric voltage data were obtained using a home-built scanning tunneling microscope break junction technique. The results show that all the OPE derivatives studied here are dominated by the lowest unoccupied molecular orbital level. The Seebeck coefficients for these molecules follow the same trend as the energy derivatives of their corresponding transmission spectra around the Fermi level. The molecule terminated with pyridyl units has the largest Seebeck coefficient corresponding to the highest slope of the transmission function at EF. Density-functional-theory-based quantum transport calculations support the experimental results.
Citation
Chen, H., Sangtarash, S., Li, G., Gantenbein, M., Cao, W., Alqorashi, A., …Hong, W. (2020). Exploring the thermoelectric properties of oligo(phenylene-ethynylene) derivatives. Nanoscale, 12(28), 15150-15156. https://doi.org/10.1039/d0nr03303k
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 19, 2020 |
Online Publication Date | Jul 13, 2020 |
Publication Date | 2020-07 |
Deposit Date | Aug 5, 2020 |
Publicly Available Date | Aug 5, 2020 |
Journal | Nanoscale |
Print ISSN | 2040-3364 |
Electronic ISSN | 2040-3372 |
Publisher | Royal Society of Chemistry |
Peer Reviewed | Peer Reviewed |
Volume | 12 |
Issue | 28 |
Pages | 15150-15156 |
DOI | https://doi.org/10.1039/d0nr03303k |
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