Ultralow Thermal Conductivity in Diamondoid Structures and High Thermoelectric Performance in (Cu 1– x Ag x )(In 1– y Ga y )Te 2
Abstract
Owing to the diversity of composition and excellent transport properties, the ternary I-III-VI2type diamond-like chalcopyrite compounds are attractive functional semiconductors including as thermoelectric materials. In this family,CuInTe2 and CuGaTe2 are well investigated and achieve maximum ZT values of ~1.4 at 950 K and an average ZT of 0.43. However, both compounds have poor electrical conductivity at low temperature, resulting in low ZT below 450K. In this work, we have greatly improved the thermoelectric performance in the quinary diamondoid compound (Cu0.8Ag0.2)(In0.2Ga0.8)Te2 by understanding and controlling the effects of different constituent elements on the thermoelectric transport properties. Our combined theoretical and experimental effort indicates that Gain the In site of the lattice decreases the density-of-states carrier effective mass and improves the electrical conductivity and power factor of Cu0.8Ag0.2In1-xGaxTe2. Furthermore, Ag in the Cu site strongly suppresses the heat transport via the enhanced acoustic phonon-optical phonon coupling effects, leading to the ultra low thermal conductivity of ~0.49 Wm-1 K-1 at 850 K in Cu0.8Ag0.2In0.2Ga0.8Te2. Defect formation energy calculations suggest intrinsic Cu vacancies introduce defect levels that are important to the temperature-dependent hole density and electrical conductivity; therefore, we introduced extra Cu vacancies to optimize the hole carrier density and improve the power factormore »
- Authors:
-
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
- Publication Date:
- Research Org.:
- Northwestern Univ., Evanston, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Sciences Foundation (NSF); Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource
- OSTI Identifier:
- 1858071
- Alternate Identifier(s):
- OSTI ID: 1834039
- Grant/Contract Number:
- SC0014520; AC02-06CH11357; AC02-05CH11231; ECCS 2025633; DMR-1720139
- Resource Type:
- Published Article
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Name: Journal of the American Chemical Society Journal Volume: 143 Journal Issue: 15; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; thermal conductivity; phonons; defects in solids; defects; electrical conductivity
Citation Formats
Xie, Hongyao, Hao, Shiqiang, Bailey, Trevor P., Cai, Songting, Zhang, Yinying, Slade, Tyler J., Snyder, G. Jeffrey, Dravid, Vinayak P., Uher, Ctirad, Wolverton, Christopher, and Kanatzidis, Mercouri G. Ultralow Thermal Conductivity in Diamondoid Structures and High Thermoelectric Performance in (Cu 1– x Ag x )(In 1– y Ga y )Te 2. United States: N. p., 2021.
Web. doi:10.1021/jacs.1c01801.
Xie, Hongyao, Hao, Shiqiang, Bailey, Trevor P., Cai, Songting, Zhang, Yinying, Slade, Tyler J., Snyder, G. Jeffrey, Dravid, Vinayak P., Uher, Ctirad, Wolverton, Christopher, & Kanatzidis, Mercouri G. Ultralow Thermal Conductivity in Diamondoid Structures and High Thermoelectric Performance in (Cu 1– x Ag x )(In 1– y Ga y )Te 2. United States. https://doi.org/10.1021/jacs.1c01801
Xie, Hongyao, Hao, Shiqiang, Bailey, Trevor P., Cai, Songting, Zhang, Yinying, Slade, Tyler J., Snyder, G. Jeffrey, Dravid, Vinayak P., Uher, Ctirad, Wolverton, Christopher, and Kanatzidis, Mercouri G. Tue .
"Ultralow Thermal Conductivity in Diamondoid Structures and High Thermoelectric Performance in (Cu 1– x Ag x )(In 1– y Ga y )Te 2". United States. https://doi.org/10.1021/jacs.1c01801.
@article{osti_1858071,
title = {Ultralow Thermal Conductivity in Diamondoid Structures and High Thermoelectric Performance in (Cu 1– x Ag x )(In 1– y Ga y )Te 2},
author = {Xie, Hongyao and Hao, Shiqiang and Bailey, Trevor P. and Cai, Songting and Zhang, Yinying and Slade, Tyler J. and Snyder, G. Jeffrey and Dravid, Vinayak P. and Uher, Ctirad and Wolverton, Christopher and Kanatzidis, Mercouri G.},
abstractNote = {Owing to the diversity of composition and excellent transport properties, the ternary I-III-VI2type diamond-like chalcopyrite compounds are attractive functional semiconductors including as thermoelectric materials. In this family,CuInTe2 and CuGaTe2 are well investigated and achieve maximum ZT values of ~1.4 at 950 K and an average ZT of 0.43. However, both compounds have poor electrical conductivity at low temperature, resulting in low ZT below 450K. In this work, we have greatly improved the thermoelectric performance in the quinary diamondoid compound (Cu0.8Ag0.2)(In0.2Ga0.8)Te2 by understanding and controlling the effects of different constituent elements on the thermoelectric transport properties. Our combined theoretical and experimental effort indicates that Gain the In site of the lattice decreases the density-of-states carrier effective mass and improves the electrical conductivity and power factor of Cu0.8Ag0.2In1-xGaxTe2. Furthermore, Ag in the Cu site strongly suppresses the heat transport via the enhanced acoustic phonon-optical phonon coupling effects, leading to the ultra low thermal conductivity of ~0.49 Wm-1 K-1 at 850 K in Cu0.8Ag0.2In0.2Ga0.8Te2. Defect formation energy calculations suggest intrinsic Cu vacancies introduce defect levels that are important to the temperature-dependent hole density and electrical conductivity; therefore, we introduced extra Cu vacancies to optimize the hole carrier density and improve the power factor of Cu0.8Ag0.2In0.2Ga0.8Te2. Finally, as a result, a maximum ZT of ~1.5 at 850 K and an average ZT of 0.78 in the temperature range of 400-850 K are obtained, which is among the highest in the diamond-like compound family.},
doi = {10.1021/jacs.1c01801},
journal = {Journal of the American Chemical Society},
number = 15,
volume = 143,
place = {United States},
year = {Tue Apr 13 00:00:00 EDT 2021},
month = {Tue Apr 13 00:00:00 EDT 2021}
}
https://doi.org/10.1021/jacs.1c01801
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