Thermoelectric Properties of <i>n</i>-Type Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br)
The multiple anion superlattice Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> has been reported to exhibit extremely low thermal conductivity along the stacking <i>c</i>-axis, making it a promising material for thermoelectric applications. In this study,...
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MDPI AG
2023-06-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/12/4329 |
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| author | Tao Wang Wanghua Hu Zhefeng Lou Zhuokai Xu Xiaohui Yang Tian Le Jialu Wang Xiao Lin |
| author_facet | Tao Wang Wanghua Hu Zhefeng Lou Zhuokai Xu Xiaohui Yang Tian Le Jialu Wang Xiao Lin |
| author_sort | Tao Wang |
| collection | DOAJ |
| description | The multiple anion superlattice Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> has been reported to exhibit extremely low thermal conductivity along the stacking <i>c</i>-axis, making it a promising material for thermoelectric applications. In this study, we investigate the thermoelectric properties of Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br) polycrystalline ceramics with different electron concentrations by adjusting the stoichiometry. Despite optimizing the electric transport, the thermal conductivity remained ultra-low and approached the Ioffe–Regel limit at high temperatures. Notably, our findings demonstrate that non-stoichiometric tuning is a promising approach for enhancing the thermoelectric performance of Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> by refining its electric transport, resulting in a figure of merit of up to 0.16 at 770 K. |
| first_indexed | 2024-03-11T02:12:42Z |
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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T02:12:42Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-b205b04748da4d17b759dccbad381c342023-11-18T11:24:43ZengMDPI AGMaterials1996-19442023-06-011612432910.3390/ma16124329Thermoelectric Properties of <i>n</i>-Type Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br)Tao Wang0Wanghua Hu1Zhefeng Lou2Zhuokai Xu3Xiaohui Yang4Tian Le5Jialu Wang6Xiao Lin7Department of Physics, Fudan University, Shanghai 200433, ChinaDepartment of Physics, Fudan University, Shanghai 200433, ChinaKey Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science, Westlake University, Hangzhou 310030, ChinaKey Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science, Westlake University, Hangzhou 310030, ChinaKey Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science, Westlake University, Hangzhou 310030, ChinaKey Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science, Westlake University, Hangzhou 310030, ChinaKey Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science, Westlake University, Hangzhou 310030, ChinaKey Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science, Westlake University, Hangzhou 310030, ChinaThe multiple anion superlattice Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> has been reported to exhibit extremely low thermal conductivity along the stacking <i>c</i>-axis, making it a promising material for thermoelectric applications. In this study, we investigate the thermoelectric properties of Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br) polycrystalline ceramics with different electron concentrations by adjusting the stoichiometry. Despite optimizing the electric transport, the thermal conductivity remained ultra-low and approached the Ioffe–Regel limit at high temperatures. Notably, our findings demonstrate that non-stoichiometric tuning is a promising approach for enhancing the thermoelectric performance of Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> by refining its electric transport, resulting in a figure of merit of up to 0.16 at 770 K.https://www.mdpi.com/1996-1944/16/12/4329thermoelectric performancethermoelectric figure of meritlow thermal conductivity |
| spellingShingle | Tao Wang Wanghua Hu Zhefeng Lou Zhuokai Xu Xiaohui Yang Tian Le Jialu Wang Xiao Lin Thermoelectric Properties of <i>n</i>-Type Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br) Materials thermoelectric performance thermoelectric figure of merit low thermal conductivity |
| title | Thermoelectric Properties of <i>n</i>-Type Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br) |
| title_full | Thermoelectric Properties of <i>n</i>-Type Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br) |
| title_fullStr | Thermoelectric Properties of <i>n</i>-Type Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br) |
| title_full_unstemmed | Thermoelectric Properties of <i>n</i>-Type Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br) |
| title_short | Thermoelectric Properties of <i>n</i>-Type Bi<sub>4</sub>O<sub>4</sub>SeX<sub>2</sub> (X = Cl, Br) |
| title_sort | thermoelectric properties of i n i type bi sub 4 sub o sub 4 sub sex sub 2 sub x cl br |
| topic | thermoelectric performance thermoelectric figure of merit low thermal conductivity |
| url | https://www.mdpi.com/1996-1944/16/12/4329 |
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