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 language | English |
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Pages (from-to) | 26256–26262 |
Number of pages | 7 |
Journal | Journal of Physical Chemistry C |
Volume | 125 |
Issue number | 47 |
Early online date | 17 Nov 2021 |
DOIs | |
Publication status | Published - 2 Dec 2021 |