Molecular electronic refrigeration against parallel phonon heat leakage channels

Fatemeh Tabatabaei, Samy Merabia, Bernd Gotsmann, Mika Prunnila, Thomas A. Niehaus (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Due to their structured density of states, molecular junctions provide rich resources to filter and control the flow of electrons and phonons. Here we compute the out of equilibrium current-voltage characteristics and dissipated heat of some recently synthesized oligophenylenes (OPE3) using the Density Functional based Tight-Binding (DFTB) method within Non-Equilibrium Green's Function Theory (NEGF). We analyze the Peltier cooling power for these molecular junctions as function of a bias voltage and investigate the parameters that lead to optimal cooling performance. In order to quantify the attainable temperature reduction, an electro-thermal circuit model is presented, in which the key electronic and thermal transport parameters enter. Overall, our results demonstrate that the studied OPE3 devices are compatible with temperature reductions of several K. Based on the results, some strategies to enable high performance devices for cooling applications are briefly discussed.

Original languageEnglish
Article number11003
Number of pages9
JournalNanoscale
Volume14
Issue number30
DOIs
Publication statusPublished - 14 Jul 2022
MoE publication typeA1 Journal article-refereed

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