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Type: Journal article
Title: Temperature-dependent tunneling in Furan Oligomer single-molecule junctions
Author: Li, H.B.
Xi, Y.-F.
Hong, Z.-W.
Yu, J.
Li, X.-X.
Liu, W.-X.
Domulevicz, L.
Jin, S.
Zhou, X.-S.
Hihath, J.
Citation: ACS sensors, 2021; 6(2):565-572
Publisher: American Chemical Society
Issue Date: 2021
ISSN: 2379-3694
Statement of
Haipeng B. Li, Yan-Feng Xi, Ze-Wen Hong, Jingxian Yu, Xiao-Xia Li, Wen-Xia Liu ... et al.
Abstract: Two commonly observed charge transport mechanisms in single-molecule junctions are coherent tunneling and incoherent hopping. It has been generally believed that tunneling processes yield temperature-independent conductance behavior and hopping processes exhibit increasing conductance with increasing temperature. However, it has recently been proposed that tunneling can also yield temperature-dependent transport due to the thermal broadening of the Fermi energy of the contacts. In this work, we examine a series of rigid, planar furan oligomers that are free from a rotational internal degree of freedom to examine the temperature dependence of tunneling transport directly over a wide temperature range (78-300 K). Our results demonstrate conductance transition from a temperature-independent regime to a temperature-dependent regime. By examining various hopping and tunneling models and the correlation between the temperature dependence of conductance and molecular orbital energy offset from the Fermi level, we conclude thermally assisted tunneling is the dominant cause for the onset of temperature-dependent conductance in these systems.
Keywords: charge transport
furan-based molecular wire
molecular electronics
single-molecular conductance
single-molecule break junction
thermally assisted tunneling
Rights: © 2021 American Chemical Society
DOI: 10.1021/acssensors.0c02278
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Appears in Collections:Aurora harvest 4
Chemistry and Physics publications

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