Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Thermoelectric and Phase Change Materials

DS 12.4: Talk

Monday, March 16, 2020, 17:15–17:30, CHE 91

Thermoelectricity of molecular junctions and their near-Carnot efficiency — •Matthias A. Popp and Heiko B. Weber — Lehrstuhl für Angewandte Physik, Staudtstraße 7, 91058 Erlangen, Germany

We report on thermoelectric transport in molecular junctions, measured with the recently developed squeezable nanojunction technique [1]. A broad ensemble of resonant tunnel junctions with metallic electrodes is investigated. We find correlations between the electric conductance G and the Seebeck coefficient S with unexpected, rigid boundaries. A comparison with the resonant tunneling model shows excellent agreement with experimental data and exposes the generality of the findings. In this framework, measuring I(V) and S for a given junction provides access to the full thermoelectric characterization of the electronic system. A rather unspecific resonant molecular junction displays significant thermoelectric conversion efficiencies. Design rules for optimized efficiency are given.
[1] M. A. Popp and H. B. Weber, Applied Physics Letters 115, 083108 (2019)