Effect of phonon confinement on the thermoelectric figure of merit of quantum wells

被引：197
|
作者：
Balandin, A [1 ]
Wang, KL [1 ]
机构：
[1] Univ Calif Los Angeles, Dept Elect Engn, Device Res Lab, Los Angeles, CA 90095 USA
来源：
JOURNAL OF APPLIED PHYSICS | 1998年 / 84卷 / 11期
关键词：
D O I：
10.1063/1.368928
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Recently, it has been shown that the thermoelectric figure of merit is strongly enhanced in quantum wells and superlattices due to two-dimensional carrier confinement. We predict that the figure of merit can increase even further in quantum well structures with free-surface or rigid boundaries. This additional increase is due to spatial confinement of acoustic phonons and corresponding modification of their group velocities. The latter leads to an increase of the phonon relaxation rates and thus, a significant drop in the lattice thermal conductivity. (C) 1998 American Institute of Physics. [S0021-8979(98)03023-0].
引用
收藏
页码：6149 / 6153
页数：5
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