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Thermal characterization of Bi2Te3/Sb2Te3 superlattices
Abstract
Superlattices offer the potential to enhance the figure of merit for thermoelectric cooling by increasing the Seebeck coefficient while decreasing the thermal conductivity compared to bulk samples. The large bulk value of ZT makes superlattices containing Bi2Te3 attractive for demonstrating benefits of using low-dimensional materials in thermoelectric applications. The present work describes measurements of the effective thermal conductivity normal to Bi2Te3/Sb2Te3 superlattices deposited on GaAs using noncontact pulsed laser heating and thermoreflectance thermometry. The data show a strong reduction in the effective thermal conductivity of the Bi2Te3/Sb2Te3 superlattices compared to bulk Bi2Te3, which can further increase thermoelectric figure of merit. The dependence of thermal conductivity on superlattice period is found to be weak, particularly at periods above 60 Å. This indicates that disorder in Bi2Te3/Sb2Te3 superlattices may limit the heat conduction process at shorter periods than in Si/Ge superlattices, for which measurements were previously reported in the literature.
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“The thermal conductivity of superlattices and nanolaminates 27, 59, 78, 79, 123, 132-138 (see Figure 6(b) for an example) has been extensively characterized using TDTR over the last 15 years.”
From Tutorial: Time-domain thermoreflectance (TDTR) for thermal property characterization of bulk and thin film materials (2018) · cites this paper as [132]
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Metadata
- Authors
- Touzelbaev, M. N., Zhou, P., Venkatasubramanian, R., & Goodson, K. E.
- Affiliations
- Stanford University (US)
- RTI International (US)
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 2001-07-15
- Volume
- 90
- Issue
- 2
- Pages
- 763-767
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W1498657046
- Cited by
- 151
- References
- 18
- Citations by year
- 2026: 3 · 2025: 8 · 2024: 4 · 2023: 6 · 2022: 5 · 2021: 5 · 2020: 5 · 2019: 8 · 2018: 8 · 2017: 7 · 2016: 9 · 2015: 8 · 2014: 6 · 2013: 7 · 2012: 8
- FWCI
- 3.23
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Applied Physics (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Advanced Thermoelectric Materials and Devices
- Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
- Physical Sciences › Engineering › Civil and Structural Engineering › Thermal Radiation and Cooling Technologies
- Keywords
- thermal conductivity, figure of merit ZT, Seebeck coefficient, thermoelectric cooling, superlattice period, low-dimensional materials, GaAs substrate, pulsed laser heating
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