Growth, morphology and stability of Au in contact with the Bi2Se3(0001) surface

Surface Science; Scanning Electron Microscopy; Surface Chemistry; ARPES; Topological Insulators; Scanning tunneling microscopy; Selenium; X-Ray Photoelectron Spectroscopy; Bismuth; ultra-high vacuum; nanotechnology

Abstract :

[en] We report a combined microscopy and spectroscopy study of Au deposited on the Bi2Se3(0001) single crystal surface. At room temperature Au forms islands, according to the Volmer–Weber growth mode. Upon annealing to 100 °C the Au deposits are not stable and assemble into larger and thicker islands. The topological surface state of Bi2Se3 is weakly affected by the presence of Au. Contrary to other metals, such as Ag or Cr, a strong chemical instability at the Au/Bi2Se3 interface is ruled out. Core level analysis highlights Bi diffusion toward the surface of Au islands, in agreement with previous findings, while chemical interaction between Au and atomic Se is limited at the interfacial region. For the investigated range of Au coverages, the Au/Bi2Se3 heterostructure is inert towards CO and CO2 exposure at low pressure (10−8 mbar) regime.

Disciplines :

Physics

Author, co-author :

Fanetti, M.

Mikulska, I.

Ferfolja, K.

Moras, P.

Sheverdyaeva, P.M.

PANIGHEL, Mirco ; CNR - Istituto Officina dei Materiali (IOM), Trieste, Laboratorio TASC, Strada Statale 14, km 163.5, 34149 Basovizza, Italy

Lodi-Rizzini, A.

Píš, I.

Nappini, S.

Valant, M.

Gardonio, S.

External co-authors :

yes

Language :

English

Title :

Growth, morphology and stability of Au in contact with the Bi2Se3(0001) surface

Publication date :

2019

Journal title :

Applied Surface Science

ISSN :

0169-4332

eISSN :

1873-5584

Volume :

471

Pages :

753 - 758

Peer reviewed :

Peer Reviewed verified by ORBi

Focus Area :

Physics and Materials Science

Additional URL :

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85058059134&doi=10.1016%2fj.apsusc.2018.11.140&partnerID=40&md5=41fc9258b29593de1ae81e16c6efea74

European Projects :

H2020 - 654360 - NFFA-Europe - NANOSCIENCE FOUNDRIES AND FINE ANALYSIS - EUROPE

Funders :

Union Européenne

Funding text :

The work was financially supported from the Slovenian Research Agency, research core funding No. P2-0377 and P2-0379. This project has received funding from the EU-H2020 research and innovation programme under grant agreement No. 654360 having benefitted from the access provided by IOM-CNR in Trieste (Italy) within the framework of the NFFA-Europe Transnational Access Activity.

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since 01 August 2024

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