Enhancement of the thermoelectric figure of merit in n-type Cu0.008Bi2Te2.7Se0.3 by using Nb doping

Kyu Hyoung Lee; Byungki Ryu; Hee Jung Park; Kimoon Lee; Jong Wook Roh; Sang Il Kim; Sungwoo Hwang; Soon Mok Choi; Jong Young Kim; Jeong Hoon Lee; Jae Hong Lim; Sung Wng Kim

doi:10.3938/jkps.68.7

Enhancement of the thermoelectric figure of merit in n-type Cu_0.008Bi₂Te_2.7Se_0.3 by using Nb doping

Kyu Hyoung Lee, Byungki Ryu, Hee Jung Park, Kimoon Lee, Jong Wook Roh, Sang Il Kim, Sungwoo Hwang, Soon Mok Choi, Jong Young Kim, Jeong Hoon Lee, Jae Hong Lim, Sung Wng Kim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

Doping with foreign atom has been shown to be an effective way to enhance the dimensionless figure of merit ZT of Bi₂Te₃-based thermoelectric raw materials. Herein, we report that doping with Nb is effective in enhancing the Seebeck coefficient of n-type Cu_0.008Bi₂Te_2.7Se_0.3 polycrystalline bulks. Considering compensation of the Seebeck coefficient due to decrease of the electrical conductivity in Nb-doped compositions, the absolute value of Seebeck coefficient rather increased benefiting from an enhancement of the density of states (DOS) effective mass m* from 1.09m₀ (Cu_0.008Bi₂Te_2.7Se_0.3) to 1.21m₀ − 1.27m₀ (Cu_0.008Bi_2−xNb_xTe_2.7Se_0.3) due to a DOS engineering effect. The values of ZT were 0.84 at 300 K and 0.86 at 320 K for Cu_0.008Bi_1.99Nb_0.01Te_2.7Se_0.3. This compositional tuning approach highlights the possibility of further enhancement of ZT for n-type Bi₂Te₃-based compounds by using a combination of nanostructuring technologies to reduce the thermal conductivity.

Original language	English
Pages (from-to)	7-11
Number of pages	5
Journal	Journal of the Korean Physical Society
Volume	68
Issue number	1
DOIs	https://doi.org/10.3938/jkps.68.7
Publication status	Published - 2016 Jan 1

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.3938/jkps.68.7

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Lee, K. H., Ryu, B., Park, H. J., Lee, K., Roh, J. W., Kim, S. I., Hwang, S., Choi, S. M., Kim, J. Y., Lee, J. H., Lim, J. H., & Kim, S. W. (2016). Enhancement of the thermoelectric figure of merit in n-type Cu_0.008Bi₂Te_2.7Se_0.3 by using Nb doping. Journal of the Korean Physical Society, 68(1), 7-11. https://doi.org/10.3938/jkps.68.7

Lee, Kyu Hyoung ; Ryu, Byungki ; Park, Hee Jung ; Lee, Kimoon ; Roh, Jong Wook ; Kim, Sang Il ; Hwang, Sungwoo ; Choi, Soon Mok ; Kim, Jong Young ; Lee, Jeong Hoon ; Lim, Jae Hong ; Kim, Sung Wng. / Enhancement of the thermoelectric figure of merit in n-type Cu_0.008Bi₂Te_2.7Se_0.3 by using Nb doping. In: Journal of the Korean Physical Society. 2016 ; Vol. 68, No. 1. pp. 7-11.

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title = "Enhancement of the thermoelectric figure of merit in n-type Cu0.008Bi2Te2.7Se0.3 by using Nb doping",

abstract = "Doping with foreign atom has been shown to be an effective way to enhance the dimensionless figure of merit ZT of Bi2Te3-based thermoelectric raw materials. Herein, we report that doping with Nb is effective in enhancing the Seebeck coefficient of n-type Cu0.008Bi2Te2.7Se0.3 polycrystalline bulks. Considering compensation of the Seebeck coefficient due to decrease of the electrical conductivity in Nb-doped compositions, the absolute value of Seebeck coefficient rather increased benefiting from an enhancement of the density of states (DOS) effective mass m* from 1.09m0 (Cu0.008Bi2Te2.7Se0.3) to 1.21m0 − 1.27m0 (Cu0.008Bi2−xNbxTe2.7Se0.3) due to a DOS engineering effect. The values of ZT were 0.84 at 300 K and 0.86 at 320 K for Cu0.008Bi1.99Nb0.01Te2.7Se0.3. This compositional tuning approach highlights the possibility of further enhancement of ZT for n-type Bi2Te3-based compounds by using a combination of nanostructuring technologies to reduce the thermal conductivity.",

author = "Lee, {Kyu Hyoung} and Byungki Ryu and Park, {Hee Jung} and Kimoon Lee and Roh, {Jong Wook} and Kim, {Sang Il} and Sungwoo Hwang and Choi, {Soon Mok} and Kim, {Jong Young} and Lee, {Jeong Hoon} and Lim, {Jae Hong} and Kim, {Sung Wng}",

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doi = "10.3938/jkps.68.7",

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Enhancement of the thermoelectric figure of merit in n-type Cu_0.008Bi₂Te_2.7Se_0.3 by using Nb doping. / Lee, Kyu Hyoung; Ryu, Byungki; Park, Hee Jung; Lee, Kimoon; Roh, Jong Wook; Kim, Sang Il; Hwang, Sungwoo; Choi, Soon Mok; Kim, Jong Young; Lee, Jeong Hoon; Lim, Jae Hong; Kim, Sung Wng.

In: Journal of the Korean Physical Society, Vol. 68, No. 1, 01.01.2016, p. 7-11.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Enhancement of the thermoelectric figure of merit in n-type Cu0.008Bi2Te2.7Se0.3 by using Nb doping

AU - Lee, Kyu Hyoung

AU - Ryu, Byungki

AU - Park, Hee Jung

AU - Lee, Kimoon

AU - Roh, Jong Wook

AU - Kim, Sang Il

AU - Hwang, Sungwoo

AU - Choi, Soon Mok

AU - Kim, Jong Young

AU - Lee, Jeong Hoon

AU - Lim, Jae Hong

AU - Kim, Sung Wng

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Doping with foreign atom has been shown to be an effective way to enhance the dimensionless figure of merit ZT of Bi2Te3-based thermoelectric raw materials. Herein, we report that doping with Nb is effective in enhancing the Seebeck coefficient of n-type Cu0.008Bi2Te2.7Se0.3 polycrystalline bulks. Considering compensation of the Seebeck coefficient due to decrease of the electrical conductivity in Nb-doped compositions, the absolute value of Seebeck coefficient rather increased benefiting from an enhancement of the density of states (DOS) effective mass m* from 1.09m0 (Cu0.008Bi2Te2.7Se0.3) to 1.21m0 − 1.27m0 (Cu0.008Bi2−xNbxTe2.7Se0.3) due to a DOS engineering effect. The values of ZT were 0.84 at 300 K and 0.86 at 320 K for Cu0.008Bi1.99Nb0.01Te2.7Se0.3. This compositional tuning approach highlights the possibility of further enhancement of ZT for n-type Bi2Te3-based compounds by using a combination of nanostructuring technologies to reduce the thermal conductivity.

AB - Doping with foreign atom has been shown to be an effective way to enhance the dimensionless figure of merit ZT of Bi2Te3-based thermoelectric raw materials. Herein, we report that doping with Nb is effective in enhancing the Seebeck coefficient of n-type Cu0.008Bi2Te2.7Se0.3 polycrystalline bulks. Considering compensation of the Seebeck coefficient due to decrease of the electrical conductivity in Nb-doped compositions, the absolute value of Seebeck coefficient rather increased benefiting from an enhancement of the density of states (DOS) effective mass m* from 1.09m0 (Cu0.008Bi2Te2.7Se0.3) to 1.21m0 − 1.27m0 (Cu0.008Bi2−xNbxTe2.7Se0.3) due to a DOS engineering effect. The values of ZT were 0.84 at 300 K and 0.86 at 320 K for Cu0.008Bi1.99Nb0.01Te2.7Se0.3. This compositional tuning approach highlights the possibility of further enhancement of ZT for n-type Bi2Te3-based compounds by using a combination of nanostructuring technologies to reduce the thermal conductivity.

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