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首页> 外文期刊>Japanese journal of applied physics >Photoacoustic Spectra and Thermoelectric Properties of Amorphous Si/Au/Ge/Au Superlattice
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Photoacoustic Spectra and Thermoelectric Properties of Amorphous Si/Au/Ge/Au Superlattice

机译：非晶硅/金/锗/金超晶格的光声光谱和热电性质

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摘要

The amorphous Si-Ge-Au superlattice shows highly superior thermoelectric properties. In this paper, we describe the photoacoustic spectra and thermoelectric properties of these materials with various Au concentrations and discuss the mechanism responsible for high thermoelectric properties. Amorphous Si/Au/Ge/Au superlattice was prepared by alternate deposition of Si, Ge and Au. The Au concentration dependence of electric and optical properties was measured. We investigated the band structure of amorphous Si-Ge-Au over a wide energy range by combining the electrical and optical measurements. The energy range was from 0.01 (the impurity level of the Au dopant) to 2 eV (band edge). We found that the Au atoms in amorphous Si-Ge not only produce strong potential fluctuations but also act as acceptor impurities.
机译：非晶Si-Ge-Au超晶格显示出极好的热电性能。在本文中，我们描述了这些材料在各种Au浓度下的光声光谱和热电性质，并讨论了导致高热电性质的机理。通过交替沉积Si，Ge和Au制备非晶Si / Au / Ge / Au超晶格。测量了电和光学性质的Au浓度依赖性。通过结合电学和光学测量，我们研究了非晶Si-Ge-Au在较宽能量范围内的能带结构。能量范围为0.01（Au掺杂剂的杂质水平）至2 eV（带边缘）。我们发现非晶Si-Ge中的Au原子不仅会产生很强的电位波动，而且还会成为受体杂质。

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