Enhancement of Thermoelectric Properties by Modulation-Doping in Silicon Germanium Alloy Nanocomposites

Modulation-doping was theoretically proposed and experimentally proved to be effective in increasing the power factor of nanocomposites (Si80Ge20)70(Si100B5)30 by increasing the carrier mobility but not the figure-of-merit (ZT) due to the increased thermal conductivity. Here we report an alternative...

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Veröffentlicht in:	Nano letters 2012-04, Vol.12 (4), p.2077-2082
Hauptverfasser:	Yu, Bo, Zebarjadi, Mona, Wang, Hui, Lukas, Kevin, Wang, Hengzhi, Wang, Dezhi, Opeil, Cyril, Dresselhaus, Mildred, Chen, Gang, Ren, Zhifeng
Format:	Artikel
Sprache:	eng
Schlagworte:	Carrier mobility Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Exact sciences and technology Heat transfer Materials science Nanocomposites Nanocrystalline materials Nanoparticles Nanoscale materials and structures: fabrication and characterization Nanostructure Physics Power factor Silicon solar (photovoltaic), solar (thermal), solid state lighting, phonons, thermal conductivity, thermoelectric, defects, mechanical behavior, charge transport, spin dynamics, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing) Thermal conductivity Thermal properties of condensed matter Thermal properties of small particles, nanocrystals, nanotubes Thermoelectricity
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Zusammenfassung:	Modulation-doping was theoretically proposed and experimentally proved to be effective in increasing the power factor of nanocomposites (Si80Ge20)70(Si100B5)30 by increasing the carrier mobility but not the figure-of-merit (ZT) due to the increased thermal conductivity. Here we report an alternative materials design, using alloy Si70Ge30 instead of Si as the nanoparticles and Si95Ge5 as the matrix, to increase the power factor but not the thermal conductivity, leading to a ZT of 1.3 ± 0.1 at 900 °C.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl3003045