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Título: | Passivation of Bi2Te3 Topological Insulator by Transferred CVD-Graphene: Toward Intermixing-Free Interfaces |
Autor: | Galceran, Regina CSIC ORCID; Bonell, Fréderic; Camosi, Lorenzo CSIC; Sauthier, Guillaume CSIC ORCID; Gebeyehu, Zewdu M. CSIC; Esplandiú, María J. CSIC ORCID; Arrighi, Aloïs CSIC; Fernández Aguirre, Iván CSIC; Figueroa, Adriana I.; Sierra, Juan F. CSIC ORCID; Valenzuela, Sergio O. CSIC ORCID | Palabras clave: | Bi2Te3 Graphene−topological insulator interface Intermixing Passivation XPS |
Fecha de publicación: | 20-dic-2022 | Editor: | Wiley-VCH | Citación: | Advanced Materials Interfaces 9(36): 2201997 (2022) | Resumen: | The investigation, and ultimate application, of topological insulators, typically involve exposure to ambient conditions or their integration with metals, which lead to surface oxidation or material intermixing. X-ray photoelectron spectroscopy (XPS) measurements that demonstrate passivated and intermixing-free interfaces in the topological insulator BiTe by means of dry-transferred CVD graphene are reported. After air exposure, no traces of BiTe oxidation are found. Furthermore, it is demonstrated that graphene acts as a very efficient metal and chalcogen diffusion barrier in BiTe/graphene/permalloy (Py) heterostructures, which are relevant for spintronics. Such results are in stark contrast with the significant surface degradation observed in bare BiTe under ambient conditions and the deep Bi-Te bonding disruption that occurs in BiTe/Py heterostructures. These findings provide a new approach to control and engineer topological insulator interfaces for spintronic applications and a new platform to investigate the combined use of graphene and topological insulator Dirac states. | Versión del editor: | http://dx.doi.org/10.1002/admi.202201997 | URI: | http://hdl.handle.net/10261/295307 | DOI: | 10.1002/admi.202201997 | Identificadores: | doi: 10.1002/admi.202201997 e-issn: 2196-7350 |
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