Methodology of Thermoelectric Power Factor Enhancement by Nanoscale Thermal Management in Bulk SiGe Composites

Shunya Sakane; Takafumi Ishibe; Kosei Mizuta; Masato Kashino; Kentaro Watanabe; Takeshi Fujita; Yoshinari Kamakura; Nobuya Mori; Yoshiaki Nakamura

doi:10.1021/acsaem.9b02340

Methodology of Thermoelectric Power Factor Enhancement by Nanoscale Thermal Management in Bulk SiGe Composites

Shunya Sakane, Takafumi Ishibe, Kosei Mizuta, Masato Kashino, Kentaro Watanabe, Takeshi Fujita, Yoshinari Kamakura, Nobuya Mori, Yoshiaki Nakamura

Advanced Institute for Materials Research (AIMR)

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We propose the methodology for thermoelectric power factor enhancement using nanoscale thermal management. The thermally managed composite is composed of a high electrical conductivity (σ) material with high thermal conductivity (κ), and a high Seebeck coefficient (S) material with lowered κ by nanostructuring, where a large temperature difference is applied to high-S materials. This brings out two better properties (high S and high σ) from the two different materials. We experimentally demonstrate that S²σ is enhanced in SiGe-Au composites compared with SiGe materials, where SiGe is used as a high-S material with low κ in Si-based materials and Au is used as a high-σ material with high κ. Therein, the nanostructured Ge-rich domains including Au with Ge nanocrystals form and work as a high-S and ultra-low-κ material. This SiGe-Au composite achieves the highest S²σ value (22 μW cm^-1 K^-2) among reported SiGe-related bulk materials (Ge fraction: 10-80%) at room temperature. This methodology would be expected as a guideline for thermoelectric performance enhancement.

Original language	English
Pages (from-to)	1235-1241
Number of pages	7
Journal	ACS Applied Energy Materials
Volume	3
Issue number	1
DOIs	https://doi.org/10.1021/acsaem.9b02340
Publication status	Published - 2020 Jan 27

Keywords

SiGe
composite
nanostructure
power factor
thermal management
thermoelectric

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Energy Engineering and Power Technology
Electrochemistry
Materials Chemistry
Electrical and Electronic Engineering

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Methodology of Thermoelectric Power Factor Enhancement by Nanoscale Thermal Management in Bulk SiGe Composites. / Sakane, Shunya; Ishibe, Takafumi; Mizuta, Kosei; Kashino, Masato; Watanabe, Kentaro; Fujita, Takeshi; Kamakura, Yoshinari; Mori, Nobuya; Nakamura, Yoshiaki.

In: ACS Applied Energy Materials, Vol. 3, No. 1, 27.01.2020, p. 1235-1241.

Research output: Contribution to journal › Article › peer-review

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title = "Methodology of Thermoelectric Power Factor Enhancement by Nanoscale Thermal Management in Bulk SiGe Composites",

abstract = "We propose the methodology for thermoelectric power factor enhancement using nanoscale thermal management. The thermally managed composite is composed of a high electrical conductivity (σ) material with high thermal conductivity (κ), and a high Seebeck coefficient (S) material with lowered κ by nanostructuring, where a large temperature difference is applied to high-S materials. This brings out two better properties (high S and high σ) from the two different materials. We experimentally demonstrate that S2σ is enhanced in SiGe-Au composites compared with SiGe materials, where SiGe is used as a high-S material with low κ in Si-based materials and Au is used as a high-σ material with high κ. Therein, the nanostructured Ge-rich domains including Au with Ge nanocrystals form and work as a high-S and ultra-low-κ material. This SiGe-Au composite achieves the highest S2σ value (22 μW cm-1 K-2) among reported SiGe-related bulk materials (Ge fraction: 10-80%) at room temperature. This methodology would be expected as a guideline for thermoelectric performance enhancement.",

keywords = "SiGe, composite, nanostructure, power factor, thermal management, thermoelectric",

author = "Shunya Sakane and Takafumi Ishibe and Kosei Mizuta and Masato Kashino and Kentaro Watanabe and Takeshi Fujita and Yoshinari Kamakura and Nobuya Mori and Yoshiaki Nakamura",

note = "Funding Information: This work was supported in part by JST CREST Grant JPMJCR1524, and Grant-in-Aid for Scientific Research A (Grants 16H02078 and 19H00853) and for Exploratory Research (19K22110), and Grant-in-Aid for JSPS Research fellow (17J00622) from JSPS KAKENHI, Japan. The authors would like to thank Dr. Y. Ohishi from Osaka University and Dr. S. Ikeuchi from ADVANCE RIKO Inc. for the thermal conductivity measurements by the laser flash method.",

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AU - Sakane, Shunya

AU - Ishibe, Takafumi

AU - Mizuta, Kosei

AU - Kashino, Masato

AU - Watanabe, Kentaro

AU - Fujita, Takeshi

AU - Kamakura, Yoshinari

AU - Mori, Nobuya

AU - Nakamura, Yoshiaki

N1 - Funding Information: This work was supported in part by JST CREST Grant JPMJCR1524, and Grant-in-Aid for Scientific Research A (Grants 16H02078 and 19H00853) and for Exploratory Research (19K22110), and Grant-in-Aid for JSPS Research fellow (17J00622) from JSPS KAKENHI, Japan. The authors would like to thank Dr. Y. Ohishi from Osaka University and Dr. S. Ikeuchi from ADVANCE RIKO Inc. for the thermal conductivity measurements by the laser flash method.

PY - 2020/1/27

Y1 - 2020/1/27

N2 - We propose the methodology for thermoelectric power factor enhancement using nanoscale thermal management. The thermally managed composite is composed of a high electrical conductivity (σ) material with high thermal conductivity (κ), and a high Seebeck coefficient (S) material with lowered κ by nanostructuring, where a large temperature difference is applied to high-S materials. This brings out two better properties (high S and high σ) from the two different materials. We experimentally demonstrate that S2σ is enhanced in SiGe-Au composites compared with SiGe materials, where SiGe is used as a high-S material with low κ in Si-based materials and Au is used as a high-σ material with high κ. Therein, the nanostructured Ge-rich domains including Au with Ge nanocrystals form and work as a high-S and ultra-low-κ material. This SiGe-Au composite achieves the highest S2σ value (22 μW cm-1 K-2) among reported SiGe-related bulk materials (Ge fraction: 10-80%) at room temperature. This methodology would be expected as a guideline for thermoelectric performance enhancement.

AB - We propose the methodology for thermoelectric power factor enhancement using nanoscale thermal management. The thermally managed composite is composed of a high electrical conductivity (σ) material with high thermal conductivity (κ), and a high Seebeck coefficient (S) material with lowered κ by nanostructuring, where a large temperature difference is applied to high-S materials. This brings out two better properties (high S and high σ) from the two different materials. We experimentally demonstrate that S2σ is enhanced in SiGe-Au composites compared with SiGe materials, where SiGe is used as a high-S material with low κ in Si-based materials and Au is used as a high-σ material with high κ. Therein, the nanostructured Ge-rich domains including Au with Ge nanocrystals form and work as a high-S and ultra-low-κ material. This SiGe-Au composite achieves the highest S2σ value (22 μW cm-1 K-2) among reported SiGe-related bulk materials (Ge fraction: 10-80%) at room temperature. This methodology would be expected as a guideline for thermoelectric performance enhancement.

KW - SiGe

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Methodology of Thermoelectric Power Factor Enhancement by Nanoscale Thermal Management in Bulk SiGe Composites

Abstract

Keywords

ASJC Scopus subject areas

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