n-type thermoelectric performance in Co-doped Bi2Te3 polycrystalline alloys

Okmin Park; Minsu Heo; Se Woong Lee; Sang Jeong Park; Hyun Sik Kim; Sang il Kim

doi:10.1016/j.mssp.2023.107694

n-type thermoelectric performance in Co-doped Bi₂Te₃ polycrystalline alloys

Okmin Park, Minsu Heo, Se Woong Lee, Sang Jeong Park, Hyun Sik Kim, Sang il Kim

Department of Materials Science and Engineering

University of Seoul

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

3 Scopus citations

Abstract

Bi₂Te₃-based alloys are studied as most suitable thermoelectric alloys at room temperature. However, the lower zT values of Se-doped n-type Bi₂Te_3-xSe_x than those of p-type Bi_xSb_2-xTe₃ still hinder provision of high device performance. In this study, in effort to search for n-type Bi₂Te₃-based alloys other than Se-doped Bi₂Te₃, electrical, thermal, and thermoelectric transport properties of Bi_2-xCo_xTe₃ (x = 0, 0.03, 0.06, 0.09, and 0.12) alloys were examined systematically. By Co doping, power factor of Bi₂Te₃ alloys was increased by 65% to 2.89 mW/mK² at 300 K. The enhanced electric transport properties were analyzed by experimental phenomenological parameters deduced from two-band model. It was also found that Co doping reduced bipolar and lattice thermal conductivities. Consequently, zT at 300 K was improved to 0.48 for Bi_1.91Co_0.09Te₃ (x = 0.09) by 37% compared to that of 0.35 for Bi₂Te₃. The maximum zT of 0.62 was obtained for Bi_1.91Co_0.09Te₃ at 400 K. The two-band model predicts that the zT of Co-doped Bi₂Te₃ can be further improved by optimizing carrier concentration.

Original language	English
Article number	107694
Journal	Materials Science in Semiconductor Processing
Volume	165
DOIs	https://doi.org/10.1016/j.mssp.2023.107694
State	Published - Oct 2023

Keywords

BiTe
Co doping
Single parabolic band model
Thermoelectric

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10.1016/j.mssp.2023.107694

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title = "n-type thermoelectric performance in Co-doped Bi2Te3 polycrystalline alloys",

abstract = "Bi2Te3-based alloys are studied as most suitable thermoelectric alloys at room temperature. However, the lower zT values of Se-doped n-type Bi2Te3-xSex than those of p-type BixSb2-xTe3 still hinder provision of high device performance. In this study, in effort to search for n-type Bi2Te3-based alloys other than Se-doped Bi2Te3, electrical, thermal, and thermoelectric transport properties of Bi2-xCoxTe3 (x = 0, 0.03, 0.06, 0.09, and 0.12) alloys were examined systematically. By Co doping, power factor of Bi2Te3 alloys was increased by 65% to 2.89 mW/mK2 at 300 K. The enhanced electric transport properties were analyzed by experimental phenomenological parameters deduced from two-band model. It was also found that Co doping reduced bipolar and lattice thermal conductivities. Consequently, zT at 300 K was improved to 0.48 for Bi1.91Co0.09Te3 (x = 0.09) by 37% compared to that of 0.35 for Bi2Te3. The maximum zT of 0.62 was obtained for Bi1.91Co0.09Te3 at 400 K. The two-band model predicts that the zT of Co-doped Bi2Te3 can be further improved by optimizing carrier concentration.",

keywords = "BiTe, Co doping, Single parabolic band model, Thermoelectric",

author = "Okmin Park and Minsu Heo and Lee, {Se Woong} and Park, {Sang Jeong} and Kim, {Hyun Sik} and Kim, {Sang il}",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd",

year = "2023",

month = oct,

doi = "10.1016/j.mssp.2023.107694",

language = "English",

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journal = "Materials Science in Semiconductor Processing",

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T1 - n-type thermoelectric performance in Co-doped Bi2Te3 polycrystalline alloys

AU - Park, Okmin

AU - Heo, Minsu

AU - Lee, Se Woong

AU - Park, Sang Jeong

AU - Kim, Hyun Sik

AU - Kim, Sang il

PY - 2023/10

Y1 - 2023/10

N2 - Bi2Te3-based alloys are studied as most suitable thermoelectric alloys at room temperature. However, the lower zT values of Se-doped n-type Bi2Te3-xSex than those of p-type BixSb2-xTe3 still hinder provision of high device performance. In this study, in effort to search for n-type Bi2Te3-based alloys other than Se-doped Bi2Te3, electrical, thermal, and thermoelectric transport properties of Bi2-xCoxTe3 (x = 0, 0.03, 0.06, 0.09, and 0.12) alloys were examined systematically. By Co doping, power factor of Bi2Te3 alloys was increased by 65% to 2.89 mW/mK2 at 300 K. The enhanced electric transport properties were analyzed by experimental phenomenological parameters deduced from two-band model. It was also found that Co doping reduced bipolar and lattice thermal conductivities. Consequently, zT at 300 K was improved to 0.48 for Bi1.91Co0.09Te3 (x = 0.09) by 37% compared to that of 0.35 for Bi2Te3. The maximum zT of 0.62 was obtained for Bi1.91Co0.09Te3 at 400 K. The two-band model predicts that the zT of Co-doped Bi2Te3 can be further improved by optimizing carrier concentration.

AB - Bi2Te3-based alloys are studied as most suitable thermoelectric alloys at room temperature. However, the lower zT values of Se-doped n-type Bi2Te3-xSex than those of p-type BixSb2-xTe3 still hinder provision of high device performance. In this study, in effort to search for n-type Bi2Te3-based alloys other than Se-doped Bi2Te3, electrical, thermal, and thermoelectric transport properties of Bi2-xCoxTe3 (x = 0, 0.03, 0.06, 0.09, and 0.12) alloys were examined systematically. By Co doping, power factor of Bi2Te3 alloys was increased by 65% to 2.89 mW/mK2 at 300 K. The enhanced electric transport properties were analyzed by experimental phenomenological parameters deduced from two-band model. It was also found that Co doping reduced bipolar and lattice thermal conductivities. Consequently, zT at 300 K was improved to 0.48 for Bi1.91Co0.09Te3 (x = 0.09) by 37% compared to that of 0.35 for Bi2Te3. The maximum zT of 0.62 was obtained for Bi1.91Co0.09Te3 at 400 K. The two-band model predicts that the zT of Co-doped Bi2Te3 can be further improved by optimizing carrier concentration.

KW - BiTe

KW - Co doping

KW - Single parabolic band model

KW - Thermoelectric

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n-type thermoelectric performance in Co-doped Bi₂Te₃ polycrystalline alloys

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