Luo, Yubo and Cai, Songting and Hao, Shiqiang and Pielnhofer, Florian and Hadar, Ido and Luo, Zhong-Zhen and Xu, Jianwei and Wolverton, Chris and Dravid, Vinayak P. and Pfitzner, Arno and Yan, Qingyu and Kanatzidis, Mercouri G. (2020) High-Performance Thermoelectrics from Cellular Nanostructured Sb2Si2Te6. JOULE, 4 (1). pp. 159-175. ISSN 2542-4351,
Full text not available from this repository. (Request a copy)Abstract
We introduce Sb2Si2Te6 as a high-performance thermoelectric material. Single-crystal X-ray diffraction analysis indicates that Sb2Si2Te6 has a layered two-dimensional structure with Sb3+ cations and [Si2Te6](6) units as building blocks adopting the Fe2P2Se6 structure type. Sb2Si2Te6 is a direct-band-gap semiconductor with valence-band maximum and conduction-band minimum at the Z point in the Brillouin zone, where the band is doubly degenerate. Polycrystalline bulk pellets of Sb2Si2Te6 with randomly packed grains exhibit an intrinsically high thermoelectric figure of merit ZT of similar to 1.08 at 823 K. We then create a cellular nanostructure with ultrathin Si2Te3 nanosheets covering the Sb2Si2Te6 grains, which act as a hole-transmitting electron-blocking filter and at the same time cause extra phonon scattering. This dual function of the cellular nanostructure achieves an ultralow thermal conductivity value of similar to 0.29 Wm(-1) K-1 and a high ZT value of similar to 1.65 at 823 K for Sb2Si2Te6, along with a high average ZT value of similar to 0.98.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LOW THERMAL-CONDUCTIVITY; HIGH-EFFICIENCY; CORE-SHELL; FIGURE; MERIT; PBTE; NANOCOMPOSITES; CONVERGENCE; CONVERSION; DISTORTION; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Arno Pfitzner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Apr 2021 11:10 |
| Last Modified: | 01 Apr 2021 11:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/45345 |
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