Enhancement of seebeck coefficient in Bi0.5Sb 1.5Te3 with high-density tellurium nanoinclusions

Sang Kim; Kyunghan Ahn; Dong Hee Yeon; Sungwoo Hwang; Hyun Sik Kim; Sang Mock Lee; Kyu Hyoung Lee

doi:10.1143/APEX.4.091801

Enhancement of seebeck coefficient in Bi_0.5Sb _1.5Te₃ with high-density tellurium nanoinclusions

Sang Kim, Kyunghan Ahn, Dong Hee Yeon, Sungwoo Hwang, Hyun Sik Kim, Sang Mock Lee, Kyu Hyoung Lee

Department of Materials Science and Engineering

Samsung

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

38 Scopus citations

Abstract

Bi_0.5Sb_1.5Te₃ films with homogeneously dispersed ∼15nm Te nanoparticles were prepared by the alternate deposition of Bi_0.5Sb_1.5Te₃ layers and Te nanoparticles. As the amount of Te nanoinclusions increased to 15 vol %, the Seebeck coefficient increased from 169 to 248 μV/K. The authors concluded that the high-density Te nanoinclusions result in a carrier energy filtering effect in Bi_0.5Sb_1.5Te₃. Consequently, the thermoelectric power factor was enhanced by 30% despite a reduction in electrical conductivity. The improvement of the power factor implies the enhancement of the thermoelectric figure of merit ZT, providing the possibility of further ZT improvement by embedding Te nanoinclusions in Bi_0.5Sb _1.5Te₃ bulk materials.

Original language	English
Article number	091801
Journal	Applied Physics Express
Volume	4
Issue number	9
DOIs	https://doi.org/10.1143/APEX.4.091801
State	Published - Sep 2011

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title = "Enhancement of seebeck coefficient in Bi0.5Sb 1.5Te3 with high-density tellurium nanoinclusions",

abstract = "Bi0.5Sb1.5Te3 films with homogeneously dispersed ∼15nm Te nanoparticles were prepared by the alternate deposition of Bi0.5Sb1.5Te3 layers and Te nanoparticles. As the amount of Te nanoinclusions increased to 15 vol %, the Seebeck coefficient increased from 169 to 248 μV/K. The authors concluded that the high-density Te nanoinclusions result in a carrier energy filtering effect in Bi0.5Sb1.5Te3. Consequently, the thermoelectric power factor was enhanced by 30% despite a reduction in electrical conductivity. The improvement of the power factor implies the enhancement of the thermoelectric figure of merit ZT, providing the possibility of further ZT improvement by embedding Te nanoinclusions in Bi0.5Sb 1.5Te3 bulk materials.",

author = "Sang Kim and Kyunghan Ahn and Yeon, {Dong Hee} and Sungwoo Hwang and Kim, {Hyun Sik} and Lee, {Sang Mock} and Lee, {Kyu Hyoung}",

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T1 - Enhancement of seebeck coefficient in Bi0.5Sb 1.5Te3 with high-density tellurium nanoinclusions

AU - Kim, Sang

AU - Ahn, Kyunghan

AU - Yeon, Dong Hee

AU - Hwang, Sungwoo

AU - Kim, Hyun Sik

AU - Lee, Sang Mock

AU - Lee, Kyu Hyoung

PY - 2011/9

Y1 - 2011/9

N2 - Bi0.5Sb1.5Te3 films with homogeneously dispersed ∼15nm Te nanoparticles were prepared by the alternate deposition of Bi0.5Sb1.5Te3 layers and Te nanoparticles. As the amount of Te nanoinclusions increased to 15 vol %, the Seebeck coefficient increased from 169 to 248 μV/K. The authors concluded that the high-density Te nanoinclusions result in a carrier energy filtering effect in Bi0.5Sb1.5Te3. Consequently, the thermoelectric power factor was enhanced by 30% despite a reduction in electrical conductivity. The improvement of the power factor implies the enhancement of the thermoelectric figure of merit ZT, providing the possibility of further ZT improvement by embedding Te nanoinclusions in Bi0.5Sb 1.5Te3 bulk materials.

AB - Bi0.5Sb1.5Te3 films with homogeneously dispersed ∼15nm Te nanoparticles were prepared by the alternate deposition of Bi0.5Sb1.5Te3 layers and Te nanoparticles. As the amount of Te nanoinclusions increased to 15 vol %, the Seebeck coefficient increased from 169 to 248 μV/K. The authors concluded that the high-density Te nanoinclusions result in a carrier energy filtering effect in Bi0.5Sb1.5Te3. Consequently, the thermoelectric power factor was enhanced by 30% despite a reduction in electrical conductivity. The improvement of the power factor implies the enhancement of the thermoelectric figure of merit ZT, providing the possibility of further ZT improvement by embedding Te nanoinclusions in Bi0.5Sb 1.5Te3 bulk materials.

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Enhancement of seebeck coefficient in Bi_0.5Sb _1.5Te₃ with high-density tellurium nanoinclusions

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