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  High carrier mobility and ultralow thermal conductivity in the synthetic layered superlattice Sn4Bi10Se19

Lu, R., Olvera, A., Bailey, T. P., Fu, J., Su, X., Veremchuk, I., et al. (2021). High carrier mobility and ultralow thermal conductivity in the synthetic layered superlattice Sn4Bi10Se19. Materials Advances, 2(7), 2382-2390. doi:10.1039/d0ma00912a.

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 Creators:
Lu, Ruiming1, Author
Olvera, Alan1, Author
Bailey, Trevor P.1, Author
Fu, Jiefei1, Author
Su, Xianli1, Author
Veremchuk, Igor2, Author              
Yin, Zhixiong1, Author
Buchanan, Brandon1, Author
Uher, Ctirad1, Author
Tang, Xinfeng1, Author
Grin, Yuri3, Author              
Poudeu, Pierre F. P.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863411              
3Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: The integration within the same crystal lattice of two or more structurally and chemically distinct building units enables the design of complex materials featuring the coexistence of dissimilar functionalities. Here we report the successful synthesis of single-phase polycrystalline powder of Sn4Bi10Se19, a ternary selenide featuring atomic-scale integration of SnSe-type and Bi2Se3-type building blocks into a large monoclinic unit cell. We found that the complex layered atomic structure along with the large size of the building blocks severely impede the crystallization of an ordered phase. Consequently, the electronic and thermal transport properties of Sn4Bi10Se19 are strongly influenced by the degree of crystallinity and atomic ordering within the crystal lattice. At temperatures below 300 K, the well-crystallized Sn4Bi10Se19 sample displays higher carrier density, carrier mobility, and electrical conductivity compared to the poorly crystallized sample, while both samples show similar electronic properties at high temperatures. Astonishingly, the crystalline sample exhibits up to 30% lower thermal conductivity at 535 K compared to the poorly crystallized sample. This suggests a more efficient phonon scattering at the ordered atomic-scale interfaces between the building blocks in the crystalline sample, owing to bond inhomogeneity and anisotropy, whereas the random orientation of building blocks in the poorly crystallized sample inhibits such effect. © The Royal Society of Chemistry.

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Language(s): eng - English
 Dates: 2021-03-022021-03-02
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/d0ma00912a
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Title: Materials Advances
Source Genre: Journal
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Pages: - Volume / Issue: 2 (7) Sequence Number: - Start / End Page: 2382 - 2390 Identifier: -