Enhanced Thermoelectric Properties of SrSi2 Composite Films with Cubic and Layered Polymorphs

SrSi2 composite films exhibit a significant improvement in thermoelectric performance through the mixture of the stable cubic phase with a metastable layered phase. The phase fraction of the cubic and layered phases in SrSi2 films is controlled by changing the deposition temperature. The film deposi...

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Published in:ACS applied energy materials 2023-06, Vol.6 (12), p.6593-6597
Main Authors: Aoyama, Kodai, Shimizu, Takao, Kuramochi, Hideto, Mesuda, Masami, Akiike, Ryo, Katase, Takayoshi, Kimura, Yoshisato, Funakubo, Hiroshi
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container_issue 12
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container_title ACS applied energy materials
container_volume 6
creator Aoyama, Kodai
Shimizu, Takao
Kuramochi, Hideto
Mesuda, Masami
Akiike, Ryo
Katase, Takayoshi
Kimura, Yoshisato
Funakubo, Hiroshi
description SrSi2 composite films exhibit a significant improvement in thermoelectric performance through the mixture of the stable cubic phase with a metastable layered phase. The phase fraction of the cubic and layered phases in SrSi2 films is controlled by changing the deposition temperature. The film deposited at 700 °C, which is composed of a semimetallic cubic phase and a small portion of a metallic layered phase, shows a high figure of merit, ZT, beyond 0.4 at around room temperature. This value is eight times larger than the previously reported one for cubic SrSi2 bulk polycrystals. These large values originate from the microstructures of the films, which reduce thermal conductivity without deterioration of the power factor.
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title Enhanced Thermoelectric Properties of SrSi2 Composite Films with Cubic and Layered Polymorphs
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