Low thermal conductivity in GeTe-based thermoelectric materials with additional activated carbon

Jimin Youn; Juhee Ryu; Hyunji Kim; Samuel Kimani Kihoi; In Sik Son; Sang Eun Chun; Seonghoon Yi; Ho Seong Lee

doi:10.1063/5.0039883

Low thermal conductivity in GeTe-based thermoelectric materials with additional activated carbon

Jimin Youn, Juhee Ryu, Hyunji Kim, Samuel Kimani Kihoi, In Sik Son, Sang Eun Chun, Seonghoon Yi, Ho Seong Lee

Kyungpook National University

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

13 Scopus citations

Abstract

In order to improve the performance of thermoelectric materials, nanoinclusions are often used to enhance phonon scattering. In this study, activated carbon, which is porous and thus has a large surface area, was incorporated in GeTe-based materials to cause increased boundary phonon scattering. Carbon dispersed in grain boundaries resulted in improved thermal properties without significant deterioration in electrical properties. Due to the extrinsic addition of activated carbon, the lattice thermal conductivity decreased by 13.8% on average. A maximum dimensionless figure of merit of 1.66 was achieved at 723 K for the Ge0.9Sb0.1Te composition with additional activated carbon.

Original language	English
Article number	053902
Journal	Applied Physics Letters
Volume	118
Issue number	5
DOIs	https://doi.org/10.1063/5.0039883
State	Published - 1 Feb 2021

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title = "Low thermal conductivity in GeTe-based thermoelectric materials with additional activated carbon",

abstract = "In order to improve the performance of thermoelectric materials, nanoinclusions are often used to enhance phonon scattering. In this study, activated carbon, which is porous and thus has a large surface area, was incorporated in GeTe-based materials to cause increased boundary phonon scattering. Carbon dispersed in grain boundaries resulted in improved thermal properties without significant deterioration in electrical properties. Due to the extrinsic addition of activated carbon, the lattice thermal conductivity decreased by 13.8% on average. A maximum dimensionless figure of merit of 1.66 was achieved at 723 K for the Ge0.9Sb0.1Te composition with additional activated carbon.",

author = "Jimin Youn and Juhee Ryu and Hyunji Kim and Kihoi, {Samuel Kimani} and Son, {In Sik} and Chun, {Sang Eun} and Seonghoon Yi and Lee, {Ho Seong}",

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T1 - Low thermal conductivity in GeTe-based thermoelectric materials with additional activated carbon

AU - Youn, Jimin

AU - Ryu, Juhee

AU - Kim, Hyunji

AU - Kihoi, Samuel Kimani

AU - Son, In Sik

AU - Chun, Sang Eun

AU - Yi, Seonghoon

AU - Lee, Ho Seong

PY - 2021/2/1

Y1 - 2021/2/1

N2 - In order to improve the performance of thermoelectric materials, nanoinclusions are often used to enhance phonon scattering. In this study, activated carbon, which is porous and thus has a large surface area, was incorporated in GeTe-based materials to cause increased boundary phonon scattering. Carbon dispersed in grain boundaries resulted in improved thermal properties without significant deterioration in electrical properties. Due to the extrinsic addition of activated carbon, the lattice thermal conductivity decreased by 13.8% on average. A maximum dimensionless figure of merit of 1.66 was achieved at 723 K for the Ge0.9Sb0.1Te composition with additional activated carbon.

AB - In order to improve the performance of thermoelectric materials, nanoinclusions are often used to enhance phonon scattering. In this study, activated carbon, which is porous and thus has a large surface area, was incorporated in GeTe-based materials to cause increased boundary phonon scattering. Carbon dispersed in grain boundaries resulted in improved thermal properties without significant deterioration in electrical properties. Due to the extrinsic addition of activated carbon, the lattice thermal conductivity decreased by 13.8% on average. A maximum dimensionless figure of merit of 1.66 was achieved at 723 K for the Ge0.9Sb0.1Te composition with additional activated carbon.

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SN - 0003-6951

VL - 118

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 5

M1 - 053902

ER -

Low thermal conductivity in GeTe-based thermoelectric materials with additional activated carbon

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