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Enhancement of thermoelectric properties by modulation-doping in silicon germanium alloy nanocomposites
Bo Yu1, Mona Zebarjadi, Hui Wang
1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Abstract:
Modulation-doping was theoretically proposed and experimentally proved to be effective in increasing the power factor of nanocomposites (Si(80)Ge(20))(70)(Si(100)B(5))(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 Si(70)Ge(30) instead of Si as the nanoparticles and Si(95)Ge(5) 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.
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