Universität zu Köln

Volykhov, Andrey A., Sanchez-Barriga, Jaime ORCID: 0000-0001-9947-6700, Sirotina, Anna P., Neudachina, Vera S., Frolov, Alexander S., Gerber, Evgeny A., Kataev, Elmar Yu, Senkovsky, Boris, Khmelevsky, Nickolay O., Aksenenko, Anatoliy Yu, Korobova, Natalia V., Knop-Gericke, Axel, Rader, Oliver ORCID: 0000-0003-3639-0971 and Yashina, Lada V. (2016). Rapid Surface Oxidation of Sb2Te3 as Indication for a Universal Trend in the Chemical Reactivity of Tetradymite Topological Insulators. Chem. Mat., 28 (24). S. 8916 - 8924. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-5002

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Abstract

Within the past few years, topological insulators (TIs) have attracted a lot of interest due to their unique electronic structure with spin-polarized topological surface states (TSSs), which may pave the way for these materials to have a great potential in multiple applications. However, to enable consideration of TIs as building blocks for novel devices, stability of TSSs toward oxidation should be tested. Among the family of TIs with a tetradymite structure, Sb2Te3 is of p-type and appears to be the least explored material since its TSS is unoccupied in the ground state, a property that allows the use of optical excitations to generate spin currents relevant for spintronics. Here, we report relatively fast surface oxidation of Sb2Te3 under ambient conditions. We show that the clean surface reacts rapidly with molecular oxygen and slowly with water, and that humidity plays an important role during oxide layer growth. In humid air, we show that Sb2Te3 oxidizes on a time scale of minutes to hours, and much faster than other tetradymite TIs. The high surface reactivity revealed by our experiments is of critical importance and must be taken into account for the production and exploitation of novel TI-based devices using Sb2Te3 as a working material. Our results contribute to the comprehensive understanding of the universal trend underlying the chemical reactivity of tetradymite TIs.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Volykhov, Andrey A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Barriga, Jaime UNSPECIFIED orcid.org/0000-0001-9947-6700 UNSPECIFIED Sirotina, Anna P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Neudachina, Vera S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Frolov, Alexander S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerber, Evgeny A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kataev, Elmar Yu UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovsky, Boris UNSPECIFIED UNSPECIFIED UNSPECIFIED Khmelevsky, Nickolay O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aksenenko, Anatoliy Yu UNSPECIFIED UNSPECIFIED UNSPECIFIED Korobova, Natalia V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Knop-Gericke, Axel UNSPECIFIED UNSPECIFIED UNSPECIFIED Rader, Oliver UNSPECIFIED orcid.org/0000-0003-3639-0971 UNSPECIFIED Yashina, Lada V. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-252224
DOI:	10.1021/acs.chemmater.6b03325
Journal or Publication Title:	Chem. Mat.
Volume:	28
Number:	24
Page Range:	S. 8916 - 8924
Date:	2016
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-5002
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INITIO MOLECULAR-DYNAMICS; AB-INITIO; TRANSITION; FILMS; METALS; BI2TE3; BI2SE3; GROWTH; PHASE Multiple languages Chemistry, Physical; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25222