Journal
APPLIED SURFACE SCIENCE
Volume 541, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148490
Keywords
Reactivity; Topological insulators; Mixed crystals; X-Ray photoelectron spectroscopy
Categories
Funding
- Russian Science Foundation (RSF) [19-42-06303]
- Impuls-und Vernetzungsfonds der Helmholtz Gemeinschaft [HRSF-0067]
- Russian Federation [MK-899.2018.3]
- University of Antwerp through BOF Grant [31445]
- Russian Science Foundation [19-42-06303] Funding Source: Russian Science Foundation
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The study found that partial substitution of tellurium by selenium atoms in mixed crystals leads to anomalously high surface reactivity towards molecular oxygen, exceeding even the most reactive binary constituent.
Three-dimensional topological insulators are exotic materials with unique properties. Tetradymite type binary chalcogenides of bismuth and antimony, as well as their mixed crystals, belong to prototypical TIs. Potential device applications of these materials require in-depth knowledge of their stability in the ambient atmosphere and other media maintained during their processing. Here we investigated the reactivity of mixed crystals with anion substitution, Bi-2(Se1-xTex)(3) and Sb2(Se1-xTex)(3), towards molecular oxygen using both in situ and ex situ X-ray photoelectron spectroscopy. The results indicate that, in contrast to cation substitution, partial substitution of tellurium by selenium atoms leads to anomalously high surface reactivity, which even exceeds that of the most reactive binary constituent. We attribute this effect to anion ordering that essentially modifies the bond geometry, especially the respective bond angles as modeled by DFT.
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