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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

» presentations   » 2010.03.23




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

D. Nozaki, H. Sevincli, W. Li, R. Gutierrez, and G. Cuniberti

DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM)
DPG Spring Meeting of the Section Condensed Matter (SKM)


2010.03.23; (H 8) Regensburg, Germany

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 electronlike 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 [1].
[1] Engineering the thermopower in semiconductor-molecule junctions: towards high thermoelectric efficiency at the nanoscale, D. Nozaki, H. Sevincli, W. Li, R. Gutierrez, and G. Cuniberti, arxiv preprint: cond-mat 0908.0438 (2009).



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