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Buffer layer free large area bi-layer graphene on SiC(0001)
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
Lund University.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
2010 (English)In: SURFACE SCIENCE, ISSN 0039-6028, Vol. 604, no 2, L4-L7 p.Article in journal (Refereed) Published
Abstract [en]

The influence of hydrogen exposures on monolayer graphene grown on the silicon terminated SiC(0 0 0 1) surface is investigated using photoelectron spectroscopy (PES), low-energy electron microscopy (LEEM) and micro low-energy electron diffraction (mu-LEED). Exposures to ionized hydrogen are shown to have a pronounced effect on the carbon buffer (interface) layer. Exposures to atomic hydrogen are shown to actually convert/transform the monolayer graphene plus carbon buffer layer to bi-layer graphene, i.e. to produce carbon buffer layer free bi-layer graphene on SiC(0 0 0 1). This process is shown to be reversible, so the initial monolayer graphene plus carbon buffer layer situation is recreated after heating to a temperature of about 950 degrees C. A tentative model of hydrogen intercalation is suggested to explain this single to bi-layer graphene transformation mechanism. Our findings are of relevance and importance for various potential applications based on graphene-SiC structures and hydrogen storage.

Place, publisher, year, edition, pages
2010. Vol. 604, no 2, L4-L7 p.
Keyword [en]
Graphene, Bi-layer, Epitaxial, Silicon carbide, LEEM, PES, Hydrogenation, LEED
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-54251DOI: 10.1016/j.susc.2009.11.011ISI: 000274591000002OAI: oai:DiVA.org:liu-54251DiVA: diva2:302300
Available from: 2010-03-05 Created: 2010-03-05 Last updated: 2013-05-07

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Virojanadara, ChariyaYakimova, RositsaJohansson, Leif I

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