Generation of multi-dimensional defect structures for synergetic engineering of hole and phonon transport: enhanced thermoelectric performance in Sb and Cu co-doped GeTe
- Authors
- Kim, Hyunho; Park, Chul Oh; Jeong, Hyerin; Kihoi, Samuel Kimani; Yi, Seonghoon; Kim, Hyun-Sik; Lee, Kyu Hyoung; Lee, Ho Seong
- Issue Date
- 7-Jun-2021
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- INORGANIC CHEMISTRY FRONTIERS, v.8, no.11, pp.2782 - 2787
- Journal Title
- INORGANIC CHEMISTRY FRONTIERS
- Volume
- 8
- Number
- 11
- Start Page
- 2782
- End Page
- 2787
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/16095
- DOI
- 10.1039/d1qi00100k
- ISSN
- 2052-1553
- Abstract
- A facile compositional tuning by Sb and Cu addition is performed to generate engineered defects in GeTe alloys with ultra-low thermal conductivity. Substitution of Sb and Cu at the Ge-site enhances the power factor due to the optimization of carrier concentration while maintaining the convergence of the valence bands. Furthermore, complex multi-dimensional defect structures including 0D (0-dimensional) substituted Sb-Ge and Cu-Ge, 2D twin and inversion boundaries, 3D herringbone structures, 3D embedded nanostructures, and 3D Cu-rich coherent precipitates are generated, which significantly reduce the lattice thermal conductivity benefitting from a collective phonon scattering. Due to this simultaneous manipulation of electronic and thermal transport properties, a maximum thermoelectric figure of merit (zT) of 1.4 was obtained at 723 K.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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