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Article

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Title

STS/STM investigations of surface evolution of Si(111)-(7x7) induced with nickel

Authors

[ 1 ] Instytut Fizyki, Wydział Fizyki Technicznej, Politechnika Poznańska | [ P ] employee

Year of publication

2003

Published in

Acta Physica Polonica A

Journal year: 2003 | Journal volume: vol. 104 | Journal number: iss. 3-4

Article type

scientific article

Publication language

english

Abstract

EN By means of scanning tunneling microscopy and spectroscopy we studied the surface evolution of Si(111)-(7 × 7) induced with nickel followed by annealing at specified temperatures (400, 600, and 800°C). Nickel evaporation resulted with 0.05 ML and 0.2 ML coverage was carried out at room temperature with the use of solid phase epitaxy. The characteristic phase formations occurred after gradual annealing the sample depending on the amount of deposited material. At very low coverages scanning tunneling microscopy observation showed two types of ring clusters (1×1-RC and clusters of the √19 × √19 reconstruction) accompanied by the Si(111)-(7 × 7) surface reconstruction. All above-mentioned phases appeared in that order as the annealing temperature increased. Deposition of about 0.2 ML of Ni followed by annealing at 600°C formed extended regions of 1 × 1 nickel silicide reconstruction. Very clear, extended regions of √19 × √19 reconstruction appeared when annealed to 800°C. The electronic properties of observed structures have been studied by the scanning tunneling spectroscopy. Spectroscopy curves measured above certain surface formations revealed the presence of the Si rest atom, NiSi, and NiSi2 local density of electronic states.

Pages (from - to)

345 - 350

DOI

10.12693/APhysPolA.104.345

URL

http://przyrbwn.icm.edu.pl/APP/PDF/104/A104Z301.pdf

License type

CC BY (attribution alone)

Open Access Mode

open journal

Open Access Text Version

final published version

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