1
|
Hu L, Fang YW, Qin F, Cao X, Zhao X, Luo Y, Repaka DVM, Luo W, Suwardi A, Soldi T, Aydemir U, Huang Y, Liu Z, Hippalgaonkar K, Snyder GJ, Xu J, Yan Q. High thermoelectric performance enabled by convergence of nested conduction bands in Pb 7Bi 4Se 13 with low thermal conductivity. Nat Commun 2021; 12:4793. [PMID: 34373453 PMCID: PMC8352968 DOI: 10.1038/s41467-021-25119-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 07/19/2021] [Indexed: 02/07/2023] Open
Abstract
Thermoelectrics enable waste heat recovery, holding promises in relieving energy and environmental crisis. Lillianite materials have been long-term ignored due to low thermoelectric efficiency. Herein we report the discovery of superior thermoelectric performance in Pb7Bi4Se13 based lillianites, with a peak figure of merit, zT of 1.35 at 800 K and a high average zT of 0.92 (450-800 K). A unique quality factor is established to predict and evaluate thermoelectric performances. It considers both band nonparabolicity and band gaps, commonly negligible in conventional quality factors. Such appealing performance is attributed to the convergence of effectively nested conduction bands, providing a high number of valley degeneracy, and a low thermal conductivity, stemming from large lattice anharmonicity, low-frequency localized Einstein modes and the coexistence of high-density moiré fringes and nanoscale defects. This work rekindles the vision that Pb7Bi4Se13 based lillianites are promising candidates for highly efficient thermoelectric energy conversion.
Collapse
Affiliation(s)
- Lei Hu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
- Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Japan.
| | - Yue-Wen Fang
- Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Japan
| | - Feiyu Qin
- Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Japan
| | - Xun Cao
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Xiaoxu Zhao
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Yubo Luo
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Durga Venkata Maheswar Repaka
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Wenbo Luo
- Institute for Advanced Materials, North China Electric Power University, Beijing, China
| | - Ady Suwardi
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Thomas Soldi
- Department of Materials and Science Engineering, Northwestern University, Evanston, IL, USA
| | - Umut Aydemir
- Department of Chemistry, Koc University, Sariyer, Istanbul, Turkey
- Koc University Boron and Advanced Materials Application and Research Center, Sariyer, Istanbul, Turkey
| | - Yizhong Huang
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Zheng Liu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Kedar Hippalgaonkar
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - G Jeffrey Snyder
- Department of Materials and Science Engineering, Northwestern University, Evanston, IL, USA
| | - Jianwei Xu
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Qingyu Yan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
| |
Collapse
|
2
|
Ma W, Record MC, Tian J, Boulet P. Influence of the stacking sequence on layered-chalcogenide properties: first principles investigation of Pb 2Bi 2Te 5. Phys Chem Chem Phys 2021; 23:11300-11313. [PMID: 33955436 DOI: 10.1039/d1cp00270h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Pb2Bi2Te5 compound has been reported in the literature with two stacking sequences -Te-Pb-Te-Bi-Te-Bi-Te-Pb-Te- and -Te-Bi-Te-Pb-Te-Pb-Te-Bi-Te- labelled in this work as A and B, respectively. The electronic and the thermoelectric properties of the Pb2Bi2Te5 compound with the 2 different stacking sequences have been determined from a series of first principles calculations using density functional theory (DFT). The related compounds PbTe and Bi2Te3 have also been investigated for comparison. Different exchange-correlation functionals have been tested, without spin-orbit coupling, which has been found to have important effects. The elastic moduli, dielectric constants, Born effective charges, and phonon dispersion within the quasi-harmonic approximation have also been calculated and based on these calculations results, the thermal conductivity has been determined by solving the Boltzmann transport equation. Additionally, the QTAIM theory was employed to explain the differences in the properties of the 2 stackings. The most interesting compound for thermoelectric applications has been found to be Pb2Bi2Te5 with the stacking B sequence. The highest zT values have been found to be 4.02 in the a-axis direction and 2.26 in the c-axis one.
Collapse
Affiliation(s)
- Weiliang Ma
- Aix-Marseille University, University of Toulon, CNRS, IM2NP, Marseille, France. and Aix-Marseille University, CNRS, MADIREL, Marseille, France.
| | | | - Jing Tian
- Aix-Marseille University, University of Toulon, CNRS, IM2NP, Marseille, France. and Aix-Marseille University, CNRS, MADIREL, Marseille, France.
| | - Pascal Boulet
- Aix-Marseille University, CNRS, MADIREL, Marseille, France.
| |
Collapse
|