Multivariate approach to single-molecule thermopower and electrical conductance measurements

Joseph M. Hamill, Christopher Weaver, Tim Albrecht

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Abstract

We report a method using scanning tunneling microscope single molecular break junction to simultaneously measure and correlate the single-molecule thermopower and electrical conductance. In contrast to previously reported approaches, it does not require custom-built electronics and takes advantage of a trace-by-trace calibration of the thermal offset at the Au/Au contact, thus greatly facilitating thermoelectric measurements at the single-molecule level. We report measurements of three molecules, 1,4-di(4-(ethynyl(phenylthioacetate))) benzene, 1,8-octanedithiol, and 4,4′-bipyridine, and determine single-molecule Seebeck coefficients of 12(3), 5(2), and −5(2) μV K–1, respectively. Furthermore, the method statistically correlates the Seebeck voltage offset, electrical conductance, and stretching displacement of the single-molecule junction and allows for direct comparison with current-distance spectroscopy results obtained at constant bias.
Original languageEnglish
Pages (from-to)26256–26262
Number of pages7
JournalJournal of Physical Chemistry C
Volume125
Issue number47
Early online date17 Nov 2021
DOIs
Publication statusPublished - 2 Dec 2021

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