Enhanced near-room-temperature thermoelectric performance in GeTe
GeTe is an excellent mid-temperature thermoelectric material with high dimensionless figure of merit ( ZT ) values at temperatures over 600 K. Its near-room-temperature performance is less studied due to the intrinsic high carrier concentration. Here, we successfully enhance the Seebeck coefficient...
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| Published in | Rare metals Vol. 41; no. 9; pp. 3027 - 3034 |
|---|---|
| Main Authors | , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Beijing
Nonferrous Metals Society of China
01.09.2022
Springer Nature B.V |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-0521 1867-7185 |
| DOI | 10.1007/s12598-022-02036-8 |
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| Abstract | GeTe is an excellent mid-temperature thermoelectric material with high dimensionless figure of merit (
ZT
) values at temperatures over 600 K. Its near-room-temperature performance is less studied due to the intrinsic high carrier concentration. Here, we successfully enhance the Seebeck coefficient of GeTe from ~ 30 to 220 μV·K
−1
at 300 K, which is achieved by AgInSe
2
alloying and Bi doping. It is demonstrated that Bi doping helps to optimize the Seebeck coefficient without deteriorating the intrinsic electrical transport properties of the matrix. A high room-temperature power factor (PF) of ~ 11 μW·cm
−1
·K
−2
is achieved for a wide range of Bi-doped samples. The simultaneously introduced abundant point defects cause mass and strain fluctuations, which decrease the lattice thermal conductivity (
κ
L
) to a low value of 0.6 W·m
−1
·K
−1
at 300 K. Due to the synergetic effects of Bi doping in AgInSe
2
-alloyed GeTe, a high room-temperature
ZT
value of 0.46 is obtained together with a high
ZT
value of 1.1 at 523 K.
Graphical abstract |
|---|---|
| AbstractList | GeTe is an excellent mid-temperature thermoelectric material with high dimensionless figure of merit (
ZT
) values at temperatures over 600 K. Its near-room-temperature performance is less studied due to the intrinsic high carrier concentration. Here, we successfully enhance the Seebeck coefficient of GeTe from ~ 30 to 220 μV·K
−1
at 300 K, which is achieved by AgInSe
2
alloying and Bi doping. It is demonstrated that Bi doping helps to optimize the Seebeck coefficient without deteriorating the intrinsic electrical transport properties of the matrix. A high room-temperature power factor (PF) of ~ 11 μW·cm
−1
·K
−2
is achieved for a wide range of Bi-doped samples. The simultaneously introduced abundant point defects cause mass and strain fluctuations, which decrease the lattice thermal conductivity (
κ
L
) to a low value of 0.6 W·m
−1
·K
−1
at 300 K. Due to the synergetic effects of Bi doping in AgInSe
2
-alloyed GeTe, a high room-temperature
ZT
value of 0.46 is obtained together with a high
ZT
value of 1.1 at 523 K.
Graphical abstract GeTe is an excellent mid-temperature thermoelectric material with high dimensionless figure of merit (ZT) values at temperatures over 600 K. Its near-room-temperature performance is less studied due to the intrinsic high carrier concentration. Here, we successfully enhance the Seebeck coefficient of GeTe from ~ 30 to 220 μV·K−1 at 300 K, which is achieved by AgInSe2 alloying and Bi doping. It is demonstrated that Bi doping helps to optimize the Seebeck coefficient without deteriorating the intrinsic electrical transport properties of the matrix. A high room-temperature power factor (PF) of ~ 11 μW·cm−1·K−2 is achieved for a wide range of Bi-doped samples. The simultaneously introduced abundant point defects cause mass and strain fluctuations, which decrease the lattice thermal conductivity (κL) to a low value of 0.6 W·m−1·K−1 at 300 K. Due to the synergetic effects of Bi doping in AgInSe2-alloyed GeTe, a high room-temperature ZT value of 0.46 is obtained together with a high ZT value of 1.1 at 523 K. |
| Author | Zhang, Hong-Xia Jia, Ning Xu, Jian-Wei Suwardi, Ady Yan, Qing-Yu Dong, Jin-Feng Li, Zhi-Liang Zhu, Qiang Ji, Rong Tan, Xian Yi |
| Author_xml | – sequence: 1 givenname: Xian Yi surname: Tan fullname: Tan, Xian Yi organization: School of Materials Science and Engineering, Nanyang Technological University, Institute of Materials Research and Engineering, Agency for Science, Technology and Research – sequence: 2 givenname: Jin-Feng orcidid: 0000-0002-3026-8054 surname: Dong fullname: Dong, Jin-Feng email: jinfeng.dong@ntu.edu.sg organization: School of Materials Science and Engineering, Nanyang Technological University – sequence: 3 givenname: Ning surname: Jia fullname: Jia, Ning organization: School of Materials Science and Engineering, Nanyang Technological University – sequence: 4 givenname: Hong-Xia surname: Zhang fullname: Zhang, Hong-Xia organization: Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei Province, College of Physics Science and Technology, Hebei University – sequence: 5 givenname: Rong surname: Ji fullname: Ji, Rong organization: Institute of Materials Research and Engineering, Agency for Science, Technology and Research – sequence: 6 givenname: Ady surname: Suwardi fullname: Suwardi, Ady organization: Institute of Materials Research and Engineering, Agency for Science, Technology and Research – sequence: 7 givenname: Zhi-Liang surname: Li fullname: Li, Zhi-Liang organization: Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei Province, College of Physics Science and Technology, Hebei University – sequence: 8 givenname: Qiang surname: Zhu fullname: Zhu, Qiang organization: Institute of Materials Research and Engineering, Agency for Science, Technology and Research – sequence: 9 givenname: Jian-Wei surname: Xu fullname: Xu, Jian-Wei organization: Institute of Materials Research and Engineering, Agency for Science, Technology and Research – sequence: 10 givenname: Qing-Yu orcidid: 0000-0003-0317-3225 surname: Yan fullname: Yan, Qing-Yu email: alexyan@ntu.edu.sg organization: School of Materials Science and Engineering, Nanyang Technological University |
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| Snippet | GeTe is an excellent mid-temperature thermoelectric material with high dimensionless figure of merit (
ZT
) values at temperatures over 600 K. Its... GeTe is an excellent mid-temperature thermoelectric material with high dimensionless figure of merit (ZT) values at temperatures over 600 K. Its... |
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| SubjectTerms | Alloying Biomaterials Bismuth Carrier density Chemistry and Materials Science Doping Energy Figure of merit Materials Engineering Materials Science Metallic Materials Nanoscale Science and Technology Original Article Physical Chemistry Point defects Power factor Room temperature Seebeck effect Temperature Thermal conductivity Thermoelectric materials Thermoelectricity Transport properties |
| Title | Enhanced near-room-temperature thermoelectric performance in GeTe |
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