Surface decorated silicon nanowires: a route to high-ZT thermoelectrics

Details Surface decorated silicon nanowires: a route to high-ZT thermoelectrics Surface decorated silicon nanowires: a route to high-ZT thermoelectrics

2009-07-13

arxiv.org/abs/0907.2138v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted for PRL

Scientific paper

Based on atomistic calculations of electron and phonon transport, we propose to use surface decorated Silicon nanowires (SiNWs) for thermoelectric applications. Two examples of surface decorations are studied to illustrate the underlying deas: Nanotrees and alkyl functionalized SiNWs. For both systems we find, (i) that the phonon conductance is significantly reduced compared to the electronic conductance leading to high thermoelectric figure of merit, $ZT$, and (ii) for ultra-thin wires surface decoration leads to significantly better performance than surface disorder.

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