High thermoelectric performance of environmentally friendly sodium-doped Cu2ZnSnS4 single crystal: Evidence of valleytronics based strategy
Abstract Thermoelectrics (TEs) are an important class of technologies for harvesting electric power directly from heat sources. To design high performace TE materials, valleytronics has great theoretical potential to maximize a dimensionless figure of merit ZT but has not yet been demonstrated experimentally. Pseudocubic structure approach based on valleytronics paves a new path to manipulate valley degeneracy and anisotoropy with low thermal conductivity caused by short-range lattice distortion. Here, we report a record high ZT = 1.6 around 800 K, realized in totally enviromentally benign Na-doped Cu2ZnSnS4 (CZTS) single crystal. The exceptional performance comes from a high power factor while maintaining intrinsically low thermal conductivity. The results demonstrate that valleytronics is a new strategy and direction in the TE field, which takes advantage of simple material nature tuning without complex techniques..
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Preprint| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
ResearchSquare.com - (2021) vom: 17. März Zur Gesamtaufnahme - year:2021 |
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| Sprache: |
Englisch |
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| Beteiligte Personen: |
Nagaoka, Akira [VerfasserIn] |
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| Links: |
Volltext [kostenfrei] |
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| doi: |
10.21203/rs.3.rs-50170/v1 |
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| PPN (Katalog-ID): |
XRA034686444 |
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| 245 | 1 | 0 | |a High thermoelectric performance of environmentally friendly sodium-doped Cu2ZnSnS4 single crystal: Evidence of valleytronics based strategy |
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| 520 | |a Abstract Thermoelectrics (TEs) are an important class of technologies for harvesting electric power directly from heat sources. To design high performace TE materials, valleytronics has great theoretical potential to maximize a dimensionless figure of merit ZT but has not yet been demonstrated experimentally. Pseudocubic structure approach based on valleytronics paves a new path to manipulate valley degeneracy and anisotoropy with low thermal conductivity caused by short-range lattice distortion. Here, we report a record high ZT = 1.6 around 800 K, realized in totally enviromentally benign Na-doped Cu2ZnSnS4 (CZTS) single crystal. The exceptional performance comes from a high power factor while maintaining intrinsically low thermal conductivity. The results demonstrate that valleytronics is a new strategy and direction in the TE field, which takes advantage of simple material nature tuning without complex techniques. | ||
| 700 | 1 | |a Yoshino, Kenji |e verfasserin |4 aut | |
| 700 | 1 | |a Masuda, Taizo |e verfasserin |4 aut | |
| 700 | 1 | |a Sparks, Taylor |e verfasserin |4 aut | |
| 700 | 1 | |a Scarpulla, Michael |e verfasserin |4 aut | |
| 700 | 1 | |a Nishioka, Kensuke |e verfasserin |4 aut | |
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