Dual Alloying Strategy to Achieve a High Thermoelectric Figure of Merit and Lattice Hardening in p-Type Nanostructured PbTe
Abstract
The introduction of an alkaline earth metal telluride as a second phase in PbTe can lead to very high thermoelectric figure of merit, ZT, as a result of hierarchical structuring, e.g., in the PbTe-SrTe system. However, there are two roadblocks to this strategy: poor solubility and occurrence of incoherent nanoprecipitates in the PbTe matrix, e.g., the PbTe-BaTe system. Here we demonstrate a dual alloying approach by simultaneously alloying CaTe and BaTe in the p-type PbTe matrix to achieve ZTmax ranging up to ~2.2 at high temperatures. Synergistic enhancement of the Seebeck coefficient via favorable band convergence gives rise to higher power factors up to 34 μW cm-1 K-2 and significant suppression of lattice thermal conductivity, κL, down to ~0.6 W m-1 K-1 results from large multicenter phonon scattering. In addition, co-inclusion of Ca and Ba causes unanticipated lattice hardening in otherwise brittle PbTe, essential for practical device applications.
- Authors:
-
[1];
[1];
[1]
- Northwestern Univ., Evanston, IL (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Publication Date:
- Research Org.:
- Northwestern Univ., Evanston, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1775433
- Grant/Contract Number:
- SC0014520
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Energy Letters
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 10; Journal ID: ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Thermoelectrics; Alloying; Lattices; Scattering; Electrical conductivity
Citation Formats
Sarkar, Sumanta, Zhang, Xiaomi, Hao, Shiqiang, Hua, Xia, Bailey, Trevor P., Uher, Ctirad, Wolverton, Chris, Dravid, Vinayak P., and Kanatzidis, Mercouri G. Dual Alloying Strategy to Achieve a High Thermoelectric Figure of Merit and Lattice Hardening in p-Type Nanostructured PbTe. United States: N. p., 2018.
Web. doi:10.1021/acsenergylett.8b01684.
Sarkar, Sumanta, Zhang, Xiaomi, Hao, Shiqiang, Hua, Xia, Bailey, Trevor P., Uher, Ctirad, Wolverton, Chris, Dravid, Vinayak P., & Kanatzidis, Mercouri G. Dual Alloying Strategy to Achieve a High Thermoelectric Figure of Merit and Lattice Hardening in p-Type Nanostructured PbTe. United States. https://doi.org/10.1021/acsenergylett.8b01684
Sarkar, Sumanta, Zhang, Xiaomi, Hao, Shiqiang, Hua, Xia, Bailey, Trevor P., Uher, Ctirad, Wolverton, Chris, Dravid, Vinayak P., and Kanatzidis, Mercouri G. Wed .
"Dual Alloying Strategy to Achieve a High Thermoelectric Figure of Merit and Lattice Hardening in p-Type Nanostructured PbTe". United States. https://doi.org/10.1021/acsenergylett.8b01684. https://www.osti.gov/servlets/purl/1775433.
@article{osti_1775433,
title = {Dual Alloying Strategy to Achieve a High Thermoelectric Figure of Merit and Lattice Hardening in p-Type Nanostructured PbTe},
author = {Sarkar, Sumanta and Zhang, Xiaomi and Hao, Shiqiang and Hua, Xia and Bailey, Trevor P. and Uher, Ctirad and Wolverton, Chris and Dravid, Vinayak P. and Kanatzidis, Mercouri G.},
abstractNote = {The introduction of an alkaline earth metal telluride as a second phase in PbTe can lead to very high thermoelectric figure of merit, ZT, as a result of hierarchical structuring, e.g., in the PbTe-SrTe system. However, there are two roadblocks to this strategy: poor solubility and occurrence of incoherent nanoprecipitates in the PbTe matrix, e.g., the PbTe-BaTe system. Here we demonstrate a dual alloying approach by simultaneously alloying CaTe and BaTe in the p-type PbTe matrix to achieve ZTmax ranging up to ~2.2 at high temperatures. Synergistic enhancement of the Seebeck coefficient via favorable band convergence gives rise to higher power factors up to 34 μW cm-1 K-2 and significant suppression of lattice thermal conductivity, κL, down to ~0.6 W m-1 K-1 results from large multicenter phonon scattering. In addition, co-inclusion of Ca and Ba causes unanticipated lattice hardening in otherwise brittle PbTe, essential for practical device applications.},
doi = {10.1021/acsenergylett.8b01684},
journal = {ACS Energy Letters},
number = 10,
volume = 3,
place = {United States},
year = {Wed Sep 26 00:00:00 EDT 2018},
month = {Wed Sep 26 00:00:00 EDT 2018}
}
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