Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system

Kyu Hyoung Lee; Yurian Kim; Dong Ho Kim; Chul Oh Park; Hyun Sik Kim; Sang il Kim

doi:10.1016/j.jmrt.2021.10.049

Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi₂Te₃–Bi₂S₃ system

Kyu Hyoung Lee, Yurian Kim, Dong Ho Kim, Chul Oh Park, Hyun Sik Kim, Sang il Kim

Department of Materials Science and Engineering

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

4 Citations (Scopus)

Abstract

Herein, we investigated the influence of sulfur (S) addition on the phase formation behavior and thermoelectric transport properties of n-type Cu_0.008Bi₂Te₃. A complete single phase of rhombohedral Bi₂Te₃ was formed in Cu_0.008Bi₂Te_2.8S_0.2, whereas a mixture of Bi₂Te₃ and Bi₂Te₂S₁ phases was generated at higher S contents. We elucidated the complex effects of S substitution at Te-site on transport properties of Cu_0.008Bi₂Te₃; (1) increase in density-of-states effective mass, (2) decrease in weighted mobility ratio, (3) reduction in lattice thermal conductivity, and (4) reduction in bipolar thermal conductivity. Despite the slight deterioration in electronic transport properties, a maximum thermoelectric figure of merit (zT) of 0.82 was achieved at 400 K in Cu_0.008Bi₂Te_2.8S_0.2 due to the synergetic effect of intensified point defect phonon scattering in a wide temperature range and suppressed bipolar thermal conduction at elevated temperatures.

Original language	English
Pages (from-to)	4781-4789
Number of pages	9
Journal	Journal of Materials Research and Technology
Volume	15
DOIs	https://doi.org/10.1016/j.jmrt.2021.10.049
Publication status	Published - 2021 Nov 1

Bibliographical note

Funding Information:
This work was supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1701-05.

Publisher Copyright:
© 2021 The Author(s)

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Biomaterials
Surfaces, Coatings and Films
Metals and Alloys

Access to Document

10.1016/j.jmrt.2021.10.049

Cite this

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title = "Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system",

abstract = "Herein, we investigated the influence of sulfur (S) addition on the phase formation behavior and thermoelectric transport properties of n-type Cu0.008Bi2Te3. A complete single phase of rhombohedral Bi2Te3 was formed in Cu0.008Bi2Te2.8S0.2, whereas a mixture of Bi2Te3 and Bi2Te2S1 phases was generated at higher S contents. We elucidated the complex effects of S substitution at Te-site on transport properties of Cu0.008Bi2Te3; (1) increase in density-of-states effective mass, (2) decrease in weighted mobility ratio, (3) reduction in lattice thermal conductivity, and (4) reduction in bipolar thermal conductivity. Despite the slight deterioration in electronic transport properties, a maximum thermoelectric figure of merit (zT) of 0.82 was achieved at 400 K in Cu0.008Bi2Te2.8S0.2 due to the synergetic effect of intensified point defect phonon scattering in a wide temperature range and suppressed bipolar thermal conduction at elevated temperatures.",

author = "Lee, {Kyu Hyoung} and Yurian Kim and Kim, {Dong Ho} and Park, {Chul Oh} and Kim, {Hyun Sik} and Kim, {Sang il}",

note = "Funding Information: This work was supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1701-05. Publisher Copyright: {\textcopyright} 2021 The Author(s)",

year = "2021",

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doi = "10.1016/j.jmrt.2021.10.049",

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T1 - Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system

AU - Lee, Kyu Hyoung

AU - Kim, Yurian

AU - Kim, Dong Ho

AU - Park, Chul Oh

AU - Kim, Hyun Sik

AU - Kim, Sang il

N1 - Funding Information: This work was supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1701-05. Publisher Copyright: © 2021 The Author(s)

PY - 2021/11/1

Y1 - 2021/11/1

N2 - Herein, we investigated the influence of sulfur (S) addition on the phase formation behavior and thermoelectric transport properties of n-type Cu0.008Bi2Te3. A complete single phase of rhombohedral Bi2Te3 was formed in Cu0.008Bi2Te2.8S0.2, whereas a mixture of Bi2Te3 and Bi2Te2S1 phases was generated at higher S contents. We elucidated the complex effects of S substitution at Te-site on transport properties of Cu0.008Bi2Te3; (1) increase in density-of-states effective mass, (2) decrease in weighted mobility ratio, (3) reduction in lattice thermal conductivity, and (4) reduction in bipolar thermal conductivity. Despite the slight deterioration in electronic transport properties, a maximum thermoelectric figure of merit (zT) of 0.82 was achieved at 400 K in Cu0.008Bi2Te2.8S0.2 due to the synergetic effect of intensified point defect phonon scattering in a wide temperature range and suppressed bipolar thermal conduction at elevated temperatures.

AB - Herein, we investigated the influence of sulfur (S) addition on the phase formation behavior and thermoelectric transport properties of n-type Cu0.008Bi2Te3. A complete single phase of rhombohedral Bi2Te3 was formed in Cu0.008Bi2Te2.8S0.2, whereas a mixture of Bi2Te3 and Bi2Te2S1 phases was generated at higher S contents. We elucidated the complex effects of S substitution at Te-site on transport properties of Cu0.008Bi2Te3; (1) increase in density-of-states effective mass, (2) decrease in weighted mobility ratio, (3) reduction in lattice thermal conductivity, and (4) reduction in bipolar thermal conductivity. Despite the slight deterioration in electronic transport properties, a maximum thermoelectric figure of merit (zT) of 0.82 was achieved at 400 K in Cu0.008Bi2Te2.8S0.2 due to the synergetic effect of intensified point defect phonon scattering in a wide temperature range and suppressed bipolar thermal conduction at elevated temperatures.

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