期刊
NANO LETTERS
卷 12, 期 4, 页码 2077-2082出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl3003045
关键词
Modulation-doping; thermoelectrics; nanocomposite; silicon germanium (SiGe); dimensionless figure-of-merit
类别
资金
- Solid State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, and Office of Basic Energy Science [DE-SC0001299/DE-FG02-09ER46577]
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 degrees C.
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