English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Impact of ordering on the reactivity of mixed crystals of topological insulators with anion substitution: Bi2SeTe2 and Sb2SeTe2

MPS-Authors
/persons/resource/persons21743

Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Volykhov, A. A., Frolov, A. S., Neudachina, V. S., Vladimirova, N. V., Gerber, E., Callaert, C., et al. (2021). Impact of ordering on the reactivity of mixed crystals of topological insulators with anion substitution: Bi2SeTe2 and Sb2SeTe2. Applied Surface Science, 541: 148490. doi:10.1016/j.apsusc.2020.148490.


Cite as: http://hdl.handle.net/21.11116/0000-0007-9971-D
Abstract
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, Bi2(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.