STS INVESTIGATIONS OF METALLIC NANOSTRUCTURES DEPOSITED ONBi2Te3

Szymon Winiarz (), Piotr Biskupski, Stanislaw Szuba, Slawomir Mielcarek and Ryszard Czajka
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Szymon Winiarz: Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznan, Poland
Piotr Biskupski: Institute of Physics, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland
Stanislaw Szuba: Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznan, Poland
Slawomir Mielcarek: Institute of Physics, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland
Ryszard Czajka: Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznan, Poland

Surface Review and Letters (SRL), 2007, vol. 14, issue 03, 357-360

Abstract: Bi2Te3has attracted attention due to its potential applications in the microfabrication of integrated thermoelectric devices. It is also interesting to study the metallization process of this compound. Metallic nanostructures were deposited by means of an electron gun evaporator in ultra high vacuum (UHV) conditions (10-8Pa) on the freshly cleaved 0001 surface of the crystalBi2Te3. Measurements were conducted using the commercially available Omicron UHV scanning tunneling microscope (STM). Scanning tunneling spectroscopy (STS) measurements were performed using current imaging tunneling spectroscopy (CITS), and subsequent calculation of thedI/dVmaps. Metallic characteristics were observed on nickel islands since early stages of the growth. CITS anddI/dVmaps showed distinct contrast between the substrate and metallic islands. Similar contrast was not observed in the case of titanium, most probably due to an intercalation process. Occurring of such a process was confirmed by the appearance of the superlattice structure.

Keywords: Scanning tunneling microscopy; scanning tunneling spectroscopies; surface structure; morphology; roughness; and topography; nickel; titanium; bismuth telluride; single crystal surfaces; superlattices; clusters; semiconducting surfaces (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07009657

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