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

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• 作者：Bo Yu ; Mona Zebarjadi ; Hui Wang ; Kevin Lukas ; Hengzhi Wang ; Dezhi Wang ; Cyril Opeil ; Mildred Dresselhaus ; Gang Chen ; Zhifeng Ren
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：April 11, 2012
• 年：2012
• 卷：12
• 期：4
• 页码：2077-2082
• 全文大小：448K
• 年卷期：v.12,no.4(April 11, 2012)
• ISSN：1530-6992

文摘

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 卤 0.1 at 900 掳C.

Keywords:

Modulation-doping; thermoelectrics; nanocomposite; silicon germanium (SiGe); dimensionless figure-of-merit