Chemical Instability of an Interface between Silver and Bi2Se3 Topological Insulator at Room Temperature
- Katja FerfoljaKatja FerfoljaMaterials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 Ajdovscina, SloveniaMore by Katja Ferfolja
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- Matjaz ValantMatjaz ValantMaterials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 Ajdovscina, SloveniaInstitute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, ChinaMore by Matjaz Valant
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- Iuliia MikulskaIuliia MikulskaDiamond Light Source Ltd., Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, U.K.More by Iuliia Mikulska
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- Sandra GardonioSandra GardonioMaterials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 Ajdovscina, SloveniaMore by Sandra Gardonio
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- Mattia Fanetti*Mattia Fanetti*E-mail: [email protected]Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 Ajdovscina, SloveniaMore by Mattia Fanetti
Abstract
Understanding an interaction at an interface between a topological insulator and a metal is of critical importance when designing electronic and spintronic devices or when such systems are used in catalysis. In this paper, we report on a chemical instability of the interface between Bi2Se3 and Ag studied by X-ray powder diffraction and electron microscopy. We present strong experimental evidence of a redox solid-state reaction occurring at the interface with kinetics that is significant already at room temperature. The reaction yields Ag2Se, AgBiSe2, and Bi. The unexpected room-temperature chemical instability of the interface should be considered for all future theoretical and applicative studies involving the interface between Bi2Se3 and Ag.
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