Thermal dissociation of CO molecules and carbon incorporation on the Si(111)-(7 x 7) surface
- Authors
- Seo, Eonmi; Eom, Daejin; Shin, Eun-Ha; Kim, Hanchul; Koo, Ja-Yong
- Issue Date
- Jun-2020
- Publisher
- ELSEVIER
- Keywords
- Scanning tunneling microscopy; Ab initio calculation; Carbon; Incorporation; Si(111)-(7 x 7) surface
- Citation
- SURFACE SCIENCE, v.696
- Journal Title
- SURFACE SCIENCE
- Volume
- 696
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/1458
- DOI
- 10.1016/j.susc.2020.121589
- ISSN
- 0039-6028
1879-2758
- Abstract
- Incorporation of carbon (C) atoms in the Si(111)-(7 x 7) surface is investigated by using scanning tunneling microscopy and density-functional theory calculations. C atoms are supplied through thermal dissociation of CO molecules adsorbed on the Si(111)-(7 x 7) surface. One C atom can be incorporated substitutionally below the Si adatoms of the (7 x 7) structure. However, the stable (7 x 7) surface can accommodate only a very small amount of C atoms and the surplus C atoms are swept away to the step edges in the form of silicon-carbon clusters, restoring the clean Si(111)-(7 x 7) structure on the flat terrace. In contrast to the B-induced root 3 x root 3 reconstruction, high density C atoms do not induce a single crystalline root 3 x root 3 reconstruction over a wide area of Si(111).
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