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    Rights statement: Copyright 2019 American Institute of Physics. The following article appeared in Applied Physics Letters, 115 (7), 2019 and may be found at http://dx.doi.org/10.1063/1.5118861 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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Efficient heating of single-molecule junctions for thermoelectric studies at cryogenic temperatures

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Article number073103
<mark>Journal publication date</mark>12/08/2019
<mark>Journal</mark>Applied Physics Letters
Issue number7
Volume115
Number of pages5
Publication statusPublished
Original languageEnglish

Abstract

The energy dependent thermoelectric response of a single molecule contains valuable information about its transmission function and its excited states. However, measuring it requires devices that can efficiently heat up one side of the molecule while being able to tune its electrochemical potential over a wide energy range. Furthermore, to increase junction stability, devices need to operate at cryogenic temperatures. In this work, we report on a device architecture to study the thermoelectric properties and the conductance of single molecules simultaneously over a wide energy range. We employ a sample heater in direct contact with the metallic electrodes contacting the single molecule which allows us to apply temperature biases up to ΔT = 60 K with minimal heating of the molecular junction. This makes these devices compatible with base temperatures Tbath < 2 K and enables studies in the linear (Δ T ≪ T molecule) and nonlinear (Δ T ≫ T molecule) thermoelectric transport regimes.

Bibliographic note

Copyright 2019 American Institute of Physics. The following article appeared in Applied Physics Letters, 115 (7), 2019 and may be found at http://dx.doi.org/10.1063/1.5118861 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.