Engineering the thermopower of C60 molecular junctions

Evangeli, Charalambos and Gillemot, Katalin and Leary, Edmund and Gonzalez, M. Teresa and Rubio-Bollinger, Gabino and Lambert, Colin and Agrait, Nicolas (2013) Engineering the thermopower of C60 molecular junctions. Nano Letters, 13 (5). pp. 2141-2145. ISSN 1530-6984

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We report the measurement of conductance and thermopower of C60 molecular junctions using a scanning tunneling microscope (STM). In contrast to previous measurements, we use the imaging capability of the STM to determine precisely the number of molecules in the junction and measure thermopower and conductance continuously and simultaneously during formation and breaking of the molecular junction, achieving a complete characterization at the single-molecule level. We find that the thermopower of C60 dimers formed by trapping a C60 on the tip and contacting an isolated C60 almost doubles with respect to that of a single C60 and is among the highest values measured to date for organic materials. Density functional theory calculations show that the thermopower and the figure of merit continue increasing with the number of C60 molecules, demonstrating the enhancement of thermoelectric preformance by manipulation of intermolecular interactions.

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Journal Article
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Nano Letters
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13 May 2013 10:48
Last Modified:
18 Sep 2023 00:41