利用声子工程优化低维结构的热电性能

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-08-29 DOI:10.1109/ICT.1999.843365

A. Balandin, A. Khitun, J. Liu, K. Wang, T. Borca-Tasciuc, G. Chen

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引用次数: 6

摘要

我们报告了在单一半导体薄膜中首次直接观察到的受限声子模式。超薄绝缘体上硅(SOI)结构的高分辨率拉曼光谱在50 cm/sup -1/到160 cm/sup -1/的光谱范围内显示出多个准等距峰。具有有限声失配的低维结构中声子输运的有限性表明了优化这些结构热电性能的额外调谐能力。我们的实验结果与最近的理论预测一致，即声子约束会导致横向晶格导热系数的强烈降低。

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Optimization of the thermoelectric properties of low-dimensional structures via phonon engineering

We report the first direct observation of confined acoustic phonon modes in a single semiconductor thin film. High-resolution Raman spectroscopy of ultra-thin silicon-on-insulator (SOI) structures reveals multiple quasi-equidistant peaks in the spectral range from 50 cm/sup -1/ to 160 cm/sup -1/. Confined nature of phonon transport in low-dimensional structures with the finite acoustic mismatch indicates an additional tuning capability for optimizing of thermoelectric properties of these structures. Our experimental results are consistent with the recent theoretical predictions of the strong decrease of the lateral lattice thermal conductivity due to phonon confinement.

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Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)

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