Lone pair driven anisotropy in antimony chalcogenide semiconductors
Antimony sulfide (Sb 2 S 3 ) and selenide (Sb 2 Se 3 ) have emerged as promising earth-abundant alternatives among thin-film photovoltaic compounds. A distinguishing feature of these materials is their anisotropic crystal structures, which are composed of quasi-one-dimensional (1D) [Sb 4 X 6 ] n rib...
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Published in | Physical chemistry chemical physics : PCCP Vol. 24; no. 12; pp. 7195 - 722 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
England
Royal Society of Chemistry
23.03.2022
|
Subjects | |
Online Access | Get full text |
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Summary: | Antimony sulfide (Sb
2
S
3
) and selenide (Sb
2
Se
3
) have emerged as promising earth-abundant alternatives among thin-film photovoltaic compounds. A distinguishing feature of these materials is their anisotropic crystal structures, which are composed of quasi-one-dimensional (1D) [Sb
4
X
6
]
n
ribbons. The interaction between ribbons has been reported to be van der Waals (vdW) in nature and Sb
2
X
3
are thus commonly classified in the literature as 1D semiconductors. However, based on first-principles calculations, here we show that inter-ribbon interactions are present in Sb
2
X
3
beyond the vdW regime. The origin of the anisotropic structures is related to the stereochemical activity of the Sb 5s lone pair according to electronic structure analysis. The impacts of structural anisotropy on the electronic, dielectric and optical properties relevant to solar cells are further examined, including the presence of higher dimensional Fermi surfaces for charge carrier transport. Our study provides guidelines for optimising the performance of Sb
2
X
3
-based photovoltaics
via
device structuring based on the underlying crystal anisotropy.
The unique electronic and optical properties of Sb
2
S
3
and Sb
2
Se
3
are connected to their underlying crystal structures and chemical bonding. |
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Bibliography: | 10.1039/d1cp05373f Electronic supplementary information (ESI) available. See DOI ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/d1cp05373f |