Thermoelectricity of near-resonant tunnel junctions and their relation to Carnot efficiency

Language
en
Document Type
Article
Issue Date
2021-02-12
Issue Year
2021
Authors
Popp, Matthias A.
Erpenbeck, André
Weber, Heiko B.
Editor
Abstract

We present a conceptual study motivated by electrical and thermoelectrical measurements on various near-resonant tunnel junctions. The squeezable nano junction technique allows the quasi-synchronous measurement of conductance G, I(V) characteristics and Seebeck coefficient S. Correlations between G and S are uncovered, in particular boundaries for S(G). We find the simplest and consistent description of the observed phenomena in the framework of the single level resonant tunneling model within which measuring I(V) and S suffice for determining all model parameters. We can further employ the model for assigning thermoelectric efficiencies η without measuring the heat flow. Within the ensemble of thermoelectric data, junctions with assigned η close to the Carnot limit can be identified. These insights allow providing design rules for optimized thermoelectric efficiency in nanoscale junctions.

Journal Title
Scientific Reports
Volume
11
Citation
Scientific Reports 11 (2021): 2031. <https://www.nature.com/articles/s41598-021-81466-3>
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