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Special Issue:
TOPICAL REVIEW — Progress in thermoelectric materials and devices
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| SPECIAL TOPIC—Progress in thermoelectric materials and devices |
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Electron delocalization enhances the thermoelectric performance of misfit layer compound (Sn1-xBixS)1.2(TiS2)2 |
| Xin Zhao(赵昕)1,†, Xuanwei Zhao(赵轩为)1,†, Liwei Lin(林黎蔚)1,‡, Ding Ren(任丁)1, Bo Liu(刘波)1, and Ran Ang(昂然)1,2,§ |
1 Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
2 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China |
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Abstract The misfit layer compound (SnS)1.2(TiS2)2 is a promising low-cost thermoelectric material because of its low thermal conductivity derived from the superlattice-like structure. However, the strong covalent bonds within each constituent layer highly localize the electrons thereby it is highly challenging to optimize the power factor by doping or alloying. Here, we show that Bi doping at the Sn site markedly breaks the covalent bonds networks and highly delocalizes the electrons. This results in a high charge carrier concentration and enhanced power factor throughout the whole temperature range. It is highly remarkable that Bi doping also significantly reduces the thermal conductivity by suppressing the heat conduction carried by phonons, indicating that it independently modulates phonon and charge transport properties. These effects collectively give rise to a maximum ZT of 0.3 at 720 K. In addition, we apply the single Kane band model and the Debye-Callaway model to clarify the electron and phonon transport mechanisms in the misfit layer compound (SnS)1.2(TiS2)2.
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Received: 17 March 2022
Revised: 01 April 2022
Accepted manuscript online: 06 April 2022
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PACS:
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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73.61.Ga
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(II-VI semiconductors)
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73.90.+f
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(Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures)
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74.25.F-
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(Transport properties)
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| Fund: This work was financially supported by the National Key Research and Development Program of China (Grant No. 2018YFA0702100), the Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences’ Large-Scale Scientific Facility (Grant No. U1932106), and the Sichuan University Innovation Research Program of China (Grant No. 2020SCUNL112). |
Corresponding Authors:
Liwei Lin, Ran Ang
E-mail: linliwei@scu.edu.cn;rang@scu.edu.cn
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Cite this article:
Xin Zhao(赵昕), Xuanwei Zhao(赵轩为), Liwei Lin(林黎蔚), Ding Ren(任丁), Bo Liu(刘波), and Ran Ang(昂然) Electron delocalization enhances the thermoelectric performance of misfit layer compound (Sn1-xBixS)1.2(TiS2)2 2022 Chin. Phys. B 31 117202
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