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Naslov:Chemical (in)stability of an interface between metals and Bi[sub]2Se[sub]3 topological insulator
Avtorji:ID Ferfolja, Katja (Avtor)
ID Fanetti, Mattia (Avtor)
ID Gardonio, Sandra (Avtor)
ID Valant, Matjaž (Avtor)
Datoteke:URL https://elsevier.conference-services.net/secureProgramme.asp?conferenceID=4266&uID=862277
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.12 - Objavljeni povzetek znanstvenega prispevka na konferenci
Organizacija:UNG - Univerza v Novi Gorici
Opis:Our research is dedicated to a study of an interface between a Bi2Se3 topological insulator (TI) and various metals due to the essential need for providing a metal contact for devices. The main objective is to characterize structural and chemical properties at the interface, where the electronic properties of the TI can be affected. The structure of the interface and processes happening at it are investigated by microscopy (SEM, TEM, STM) and spectroscopy techniques (EDX, XPS). The research started with the noble metals: Ag, Au and Pt. A good stability was observed for Au and Pt, whereas Ag reacted with Bi2Se3 already at room temperature, producing Ag2Se and AgBiSe2 phase. Interface stability was also checked at high temperature and results showed that the Au coating undergoes a coalescence process starting from 100 °C whereas the interface with Pt does not show any change at least up to 350 °C. At present we are focused on the interface with Ti, a metal which is regularly used as an adhesive layer in electrical contacts. At low coverage (<30 nm) Ti forms an extremely flat film, smoother than Au, Ag or Pt. At higher coverage the film undergoes buckle delamination, likely induced by stress release. The observed morphology indicates that a chemical interaction leads to the growth of the initial smooth Ti epitaxial film. Se interdiffusion and formation of interfacial TixSey phase is envisaged, as suggested from preliminary TEM observations of the interface structure. The presented results show the importance of the processes happening at the interface, especially solid-state chemical reactions, which are often neglected in the study of systems with metal/TI interfaces. Such instability has to be taken into account since the produced phases can affect transport properties of the material, increase a contact resistance or affect functionality of devices.
Ključne besede:Bi2Se3, interface, topological insulator, chemical instability
Leto izida:2019
Št. strani:1 str.
PID:20.500.12556/RUNG-6683 Novo okno
COBISS.SI-ID:73571843 Novo okno
UDK:54
NUK URN:URN:SI:UNG:REP:YLO6CYJM
Datum objave v RUNG:20.08.2021
Število ogledov:3189
Število prenosov:14
Metapodatki:XML DC-XML DC-RDF
:
FERFOLJA, Katja, FANETTI, Mattia, GARDONIO, Sandra in VALANT, Matjaž, 2019, Chemical (in)stability of an interface between metals and Bi[sub]2Se[sub]3 topological insulator. V : 3rd International Conference on Applied Surface Science Conference information, 17-20 June 2019, Pisa, Italy [na spletu]. Objavljeni povzetek znanstvenega prispevka na konferenci. Pisa. 2019. [Dostopano 7 april 2025]. Pridobljeno s: https://elsevier.conference-services.net/secureProgramme.asp?conferenceID=4266&uID=862277
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Naslov:3rd International Conference on Applied Surface Science Conference information, 17-20 June 2019, Pisa, Italy
Kraj izida:Pisa
Založnik:s. n.
Leto izida:2019
COBISS.SI-ID:6675482 Novo okno

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