Two-dimensional tellurium superstructures on Au(111) surfaces

Umamahesh Thupakula, Priya Laha, Gertjan Lippertz, Koen Schouteden, Asteriona Maria Netsou, Aleksandr Seliverstov, Herman Terryn, Lino M.C. Pereira, Chris Van Haesendonck

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Two-dimensional (2D) allotropes of tellurium (Te), recently coined as tellurene, are currently an emerging topic of materials research due to the theoretically predicted exotic properties of Te in its ultrathin form and at the single atomic layer limit. However, a prerequisite for the production of such new and single elemental 2D materials is the development of simple and robust fabrication methods. In the present work, we report three different 2D superstructures of Te on Au(111) surfaces by following an alternative experimental deposition approach. We have investigated the superstructures using low-temperature scanning tunneling microscopy and spectroscopy, Auger electron spectroscopy (AES), and field emission AES. Three superstructures (13 × 13, 8 × 4, and √11 × √11) of 2D Te are observed in our experiments, and the formation of these superstructures is accompanied by the lifting of the characteristic 23 × √3 surface reconstruction of the Au(111) surface. Scanning tunneling spectroscopy reveals a strong dependence of the local electronic properties on the structural arrangement of the Te atoms on the Au(111) support, and we observe superstructure-dependent electronic resonances around the Fermi level and below the Au(111) conduction band. In addition to the appearance of the new electronic resonances, the emergence of band gaps with a p-type charge character has been evidenced for two out of three Te superstructures (13 × 13 and √11 × √11) on the Au(111) support.

Original languageEnglish
Article number164703
JournalJournal of Chemical Physics
Issue number16
Publication statusPublished - 28 Oct 2022

Bibliographical note

Funding Information:
This work was funded by the KU Leuven and the Research Foundation—Flanders (FWO, Belgium). G. Lippertz acknowledges the support from the Research Foundation—Flanders (FWO, Belgium), Project Nos. 27531 and 52751.

Publisher Copyright:
© 2022 Author(s).

Copyright 2022 Elsevier B.V., All rights reserved.


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