Enhancement of Thermoelectric Properties by Modulation-Doping in Silicon Germanium Alloy Nanocomposites
Nano Letters2012Vol. 12(4), pp. 2077–2082
Citations Over TimeTop 1% of 2012 papers
Bo Yu, Mona Zebarjadi, Hui Wang, Kevin Lukas, Hengzhi Wang, Dezhi Wang, Cyril Opeil, M. S. Dresselhaus, Gang Chen, Zhifeng Ren
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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