Engineering the thermopower in semiconductor-molecule junctions: towards high thermoelectric efficiency at the nanoscale

Details Engineering the thermopower in semiconductor-molecule junctions: towards high thermoelectric efficiency at the nanoscale Engineering the thermopower in semiconductor-molecule junctions: towards high thermoelectric efficiency at the nanoscale

2009-08-04

arxiv.org/abs/0908.0438v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

We propose a possible route to achieve high thermoelectric efficiency in molecular junctions by combining a local chemical tuning of the molecular electronic states with the use of semiconducting electrodes. The former allows to control the position of the HOMO transmission resonance with respect to the Fermi energy while the latter fulfills a twofold purpose: the suppression of electron-like contributions to the thermopower and the cut-off of the HOMO transmission tails into the semiconductor band gap. As a result a large thermopower can be obtained. Our results strongly suggest that large figures of merit in such molecular junctions can be achieved.

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