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Semiconducting Ge clathrates: Promising candidates for thermoelectric applications
Abstract
Transport properties of polycrystalline Ge clathrates with general composition Sr8Ga16Ge30 are reported in the temperature range 5 K⩽T⩽300 K. These compounds exhibit N-type semiconducting behavior with relatively high Seebeck coefficients and electrical conductivity, and room temperature carrier concentrations in the range of 1017–1018 cm−3. The thermal conductivity is more than an order of magnitude smaller than that of crystalline germanium and has a glasslike temperature dependence. The resulting thermoelectric figure of merit, ZT, at room temperature for the present samples is 14 that of Bi2Te3 alloys currently used in devices for thermoelectric cooling. Extrapolating our measurements to above room temperature, we estimate that ZT>1 at T>700 K, thus exceeding that of most known materials.
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Citations
Cites
Thermal Conductivity of Silicon and Germanium from 3°K to the Melting Point
Glassbrenner, C. J., & Slack, G. A. (1964) · Physical Review · doi:10.1103/physrev.134.a1058 · Cited by 1,652
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Cited by
BiCuSeO oxyselenides: new promising thermoelectric materials
Zhao, L.-D., He, J., Berardan, D., Lin, Y., Li, J.-F., Nan, C.-W., & Dragoe, N. (2014) · Energy Environ. Sci. · doi:10.1039/c4ee00997e · Cited by 722
Glasslike Heat Conduction in High-Mobility Crystalline Semiconductors
Cohn, J. L., Nolas, G. S., Fessatidis, V., Metcalf, T. H., & Slack, G. A. (1999) · Physical Review Letters · doi:10.1103/physrevlett.82.779 · Cited by 668
Self-citationSurvey of energy scavenging for wearable and implantable devices
Ghomian, T., & Mehraeen, S. (2019) · Energy · doi:10.1016/j.energy.2019.04.088 · Cited by 126
Optical conductivity from local anharmonic phonons
Matsumoto, H., Mori, T., Iwamoto, K., Goshima, S., Kushibiki, S., & Toyota, N. (2009) · Physical Review B · doi:10.1103/physrevb.79.214306 · Cited by 18
Metadata
- Authors
- Nolas, G. S., Cohn, J. L., Slack, G. A., & Schujman, S. B.
- Venue
- Applied Physics Letters
- Publisher
- AIP Publishing
- Published
- 1998-07-13
- Volume
- 73
- Issue
- 2
- Pages
- 178-180
- ISSN
- 0003-6951 (ISSN-L)
- 1077-3118
- OpenAlex
- W1975398237
- Cited by
- 962
- References
- 1
- FWCI
- 25.13
- Type
- journal article
- Language
- en
- Open access
- closed
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- Nolas, G. S., Cohn, J. L., Slack, G. A., & Schujman, S. B. (1998). Semiconducting Ge clathrates: Promising candidates for thermoelectric applications. Applied Physics Letters. https://doi.org/10.1063/1.121747
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
