Enhanced thermoelectric performance through energy-filtering effects in nanocomposites dispersed with metallic particles

Enhanced thermoelectric performance through energy-filtering effects in nanocomposites dispersed with metallic particles
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通过分散有金属颗粒的纳米复合材料的能量过滤效应增强热电性能

DOI:
10.1063/1.4755768
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发表时间:
2012-09
影响因子:
4
通讯作者:
Qin, X. Y.
Qin, X. Y.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu, M.;Qin, X. Y.

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在弛豫时间近似下,利用Boltzmann输运方程研究了含有金属纳米夹杂物的半导体材料的热电性质。结果表明,由于金属纳米夹杂物诱导界面势垒的作用,塞贝克系数显著提高,当势垒高度在 附近大于费米能量(这里的kB为玻尔兹曼常数)时,在T < 700kBt处有最优的功率因数。此外,还发现半径为1-2 nm的高浓度纳米夹杂物可以通过能量选择性载流子散射有效地提高纳米复合材料的热电性能。
The thermoelectric properties of semiconductor materials with metallic nanoinclusions were investigated by using the Boltzmann transport equation under the relaxation time approximation. The results showed that the Seebeck coefficient can be significantly enhanced due to interface potential barrier induced by metallic nanoinclusions, leading to the optimized power factor at T < 700 K as barrier height is around kBT larger than the Fermi energy (here, kB is the Boltzmann constant). Additionally, it was found that high-concentration nanoinclusions with radius 1–2 nm can effectively enhance the thermoelectric performance of nanocomposites through energy-selective carrier scattering.
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