Origin of O 1s core-level shifts on oxygen adsorbed Si(111)-(7x7)
SCIE
SCOPUS
- Title
- Origin of O 1s core-level shifts on oxygen adsorbed Si(111)-(7x7)
- Authors
- Lee, SH; Kang, MH
- Date Issued
- 2000-02-21
- Publisher
- AMERICAN PHYSICAL SOC
- Abstract
- Density functional calculations are used to examine the chemical and structural origin of O 1s core-level shifts measured on the initial oxidation stage of Si(111)-(7 x 7). Our analysis of metastable core-level peaks leads to a conclusive identification of the long-sought metastable oxidation species as a tetrahedral SiO4 unit, formed by two successive O-2 adsorptions on a Si adatom. The origin of a higher-binding core-level shoulder is clarified by the presence of a threefold-coordinated subsurface O atom, introduced as a decay product of the metastable SiO4 unit. The present study provides a detailed atomic-scale picture of the initial oxidation process of Si(111)-(7 x 7).
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12415
- DOI
- 10.1103/PhysRevLett.84.1724
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- PHYSICAL REVIEW LETTERS, vol. 84, no. 8, page. 1724 - 1727, 2000-02-21
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