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ELECTRONIC PROPERTY OF NA-DOPED EPITAXIAL GRAPHENES ON SIC

Title
ELECTRONIC PROPERTY OF NA-DOPED EPITAXIAL GRAPHENES ON SIC
Authors
Choi, SMJhi, SH
POSTECH Authors
Jhi, SH
Date Issued
2009-04
Publisher
AMER INST PHYSICS
Abstract
The electronic property of epitaxial graphenes with Na adsorption or intercalation is studied with the use of pseudopotential density functional method. It is found that the charge transfer and the Na binding energy show strong coverage dependence. Calculated energetics shows that Na prefers the intercalation between the buffer and top graphene layers to the adsorption on top graphene layer. The buffer layer is inert to Na adsorption on top graphene layer but it is charged when Na atoms are intercalated. This indicates that the conduction of epitaxial graphenes can be affected significantly by Na intercalation.
Keywords
adsorption; binding energy; buffer layers; charge exchange; density functional theory; doping; electrical conductivity; epitaxial layers; graphene; pseudopotential methods; sodium; GRAPHITE; 6H-SIC(0001)
URI
https://oasis.postech.ac.kr/handle/2014.oak/28835
DOI
10.1063/1.3120274
ISSN
0003-6951
Article Type
Article
Citation
APPLIED PHYSICS LETTERS, vol. 94, no. 15, page. 153108 - 153110, 2009-04
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