Se-induced enhancement of the high-temperature thermoelectric performance of n-type Cu0.008Bi2(Te,Se)3 alloys due to suppressed bipolar conduction

Seungki Jo; Hyun Sik Kim; Yurian Kim; Sang il Kim; Kyu Hyoung Lee

doi:10.1016/j.jallcom.2021.161030

Se-induced enhancement of the high-temperature thermoelectric performance of n-type Cu_0.008Bi₂(Te,Se)₃ alloys due to suppressed bipolar conduction

Seungki Jo, Hyun Sik Kim, Yurian Kim, Sang il Kim, Kyu Hyoung Lee

Department of Materials Science and Engineering

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

7 Scopus citations

Abstract

Bipolar conduction in Bi-Te-based alloys is a critical barrier to high conversion efficiency in thermoelectric power generation applications. Herein, we investigate the effect of Te/Se ratio control on bipolar conduction in n-type Cu_0.008Bi₂(Te,Se)₃. Based on the two-band model and Callaway model, we found that electronic and thermal transports of minority carriers (holes) were gradually decreased with an increase in Se content. The high-temperature power factor of Se-rich Cu_0.008Bi₂Te_2.1Se_0.9 was higher in value compared to reference Cu_0.008Bi₂Te_2.7Se_0.3 due to the weighted mobility ratio increase, and its bipolar thermal conductivity was significantly reduced simultaneously. As a result, a peak figure of merit (zT) of 0.92 was obtained at 440 K in Cu_0.008Bi₂Te_2.1Se_0.9.

Original language	English
Article number	161030
Journal	Journal of Alloys and Compounds
Volume	884
DOIs	https://doi.org/10.1016/j.jallcom.2021.161030
State	Published - 5 Dec 2021

Keywords

Bi(Te
Bipolar conduction
Se)
Thermoelectric
Weighted mobility ratio

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10.1016/j.jallcom.2021.161030

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title = "Se-induced enhancement of the high-temperature thermoelectric performance of n-type Cu0.008Bi2(Te,Se)3 alloys due to suppressed bipolar conduction",

abstract = "Bipolar conduction in Bi-Te-based alloys is a critical barrier to high conversion efficiency in thermoelectric power generation applications. Herein, we investigate the effect of Te/Se ratio control on bipolar conduction in n-type Cu0.008Bi2(Te,Se)3. Based on the two-band model and Callaway model, we found that electronic and thermal transports of minority carriers (holes) were gradually decreased with an increase in Se content. The high-temperature power factor of Se-rich Cu0.008Bi2Te2.1Se0.9 was higher in value compared to reference Cu0.008Bi2Te2.7Se0.3 due to the weighted mobility ratio increase, and its bipolar thermal conductivity was significantly reduced simultaneously. As a result, a peak figure of merit (zT) of 0.92 was obtained at 440 K in Cu0.008Bi2Te2.1Se0.9.",

keywords = "Bi(Te, Bipolar conduction, Se), Thermoelectric, Weighted mobility ratio",

author = "Seungki Jo and Kim, {Hyun Sik} and Yurian Kim and Kim, {Sang il} and Lee, {Kyu Hyoung}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = dec,

day = "5",

doi = "10.1016/j.jallcom.2021.161030",

language = "English",

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journal = "Journal of Alloys and Compounds",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Se-induced enhancement of the high-temperature thermoelectric performance of n-type Cu0.008Bi2(Te,Se)3 alloys due to suppressed bipolar conduction

AU - Jo, Seungki

AU - Kim, Hyun Sik

AU - Kim, Yurian

AU - Kim, Sang il

AU - Lee, Kyu Hyoung

PY - 2021/12/5

Y1 - 2021/12/5

N2 - Bipolar conduction in Bi-Te-based alloys is a critical barrier to high conversion efficiency in thermoelectric power generation applications. Herein, we investigate the effect of Te/Se ratio control on bipolar conduction in n-type Cu0.008Bi2(Te,Se)3. Based on the two-band model and Callaway model, we found that electronic and thermal transports of minority carriers (holes) were gradually decreased with an increase in Se content. The high-temperature power factor of Se-rich Cu0.008Bi2Te2.1Se0.9 was higher in value compared to reference Cu0.008Bi2Te2.7Se0.3 due to the weighted mobility ratio increase, and its bipolar thermal conductivity was significantly reduced simultaneously. As a result, a peak figure of merit (zT) of 0.92 was obtained at 440 K in Cu0.008Bi2Te2.1Se0.9.

AB - Bipolar conduction in Bi-Te-based alloys is a critical barrier to high conversion efficiency in thermoelectric power generation applications. Herein, we investigate the effect of Te/Se ratio control on bipolar conduction in n-type Cu0.008Bi2(Te,Se)3. Based on the two-band model and Callaway model, we found that electronic and thermal transports of minority carriers (holes) were gradually decreased with an increase in Se content. The high-temperature power factor of Se-rich Cu0.008Bi2Te2.1Se0.9 was higher in value compared to reference Cu0.008Bi2Te2.7Se0.3 due to the weighted mobility ratio increase, and its bipolar thermal conductivity was significantly reduced simultaneously. As a result, a peak figure of merit (zT) of 0.92 was obtained at 440 K in Cu0.008Bi2Te2.1Se0.9.

KW - Bi(Te

KW - Bipolar conduction

KW - Se)

KW - Thermoelectric

KW - Weighted mobility ratio

UR - http://www.scopus.com/inward/record.url?scp=85111789192&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2021.161030

DO - 10.1016/j.jallcom.2021.161030

M3 - Article

AN - SCOPUS:85111789192

SN - 0925-8388

VL - 884

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 161030

ER -

Se-induced enhancement of the high-temperature thermoelectric performance of n-type Cu_0.008Bi₂(Te,Se)₃ alloys due to suppressed bipolar conduction

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Keywords

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