Thermoelectric figure of merit of Si and SiGe quantum wires was theoretically investigated rigorously taking into account spatial confinement of both electrons and phonons. The calculations were carried out for cylindrical quantum wires with radius 1.5 nm <a<15 nm and infinite potential barriers. A significant enhancement of the thermoelectric figure of merit is predicted despite the decrease of the carrier mobility in very narrow quantum wires. The enhancement is mostly due to the drop in the lattice thermal conductivity caused by the spatial confinement of acoustic phonons and the corresponding increase in phonon relaxation rates.
|Number of pages||4|
|Journal||International Conference on Thermoelectrics, ICT, Proceedings|
|Publication status||Published - 1999|
|Event||18th International Conference on Thermoelectrics (ICT'99) - Baltimore, MD, USA|
Duration: 1999 Aug 29 → 1999 Sep 2
All Science Journal Classification (ASJC) codes