Structural and Electronic Properties of Graphene on 4H- and 3C-SiC
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Graphene is a one-atom-tick carbon layer arranged in a honeycomb lattice. Graphene was first experimentally demonstrated by Andre Geim and Konstantin Novoselov in 2004 using mechanical exfoliation of highly oriented pyrolytic graphite (exfoliated graphene flakes), for which they received the Nobel Prize in Physics in 2010. Exfoliated graphene flakes show outstanding electronic properties, e.g., very high free charge carrier mobility parameters and ballistic transport at room temperature. This makes graphene a suitable material for next generation radio-frequency and terahertz electronic devices. Such applications require fabrication methods of large-area graphene compatible with electronic industry. Graphene grown by sublimation on silicon carbide (SiC) offers a viable route towards production of large-area, electronic-grade material on semi-insulating substrate without the need of transfer. Despite the intense investigations in the field, uniform wafer-scale graphene with very high-quality that matches the properties of exfoliated graphene has not been achieved yet. The key point is to identify and control how the substrate affects graphene uniformity, thickness, layer stacking, structural and electronic properties. Of particular interest is to understand the effects of SiC surface polarity and polytype on graphene properties in order to achieve large-area material with tailored properties for electronic applications. The main objectives of this thesis are to address these issues by investigating the structural and electronic properties of epitaxial graphene grown on 4HSiC and 3C-SiC substrates with different surface polarities. The first part of the thesis includes a general description of the properties of graphene, bilayer graphene and graphite. Then, the properties of epitaxial graphene on SiC by sublimation are detailed. The experimental techniques used to characterize graphene are described. A summary of all papers and contribution to the field is presented at the end of Part I. Part II consists of seven papers.
Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2016. , 74 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1793
Condensed Matter Physics Materials Chemistry Textile, Rubber and Polymeric Materials Other Materials Engineering Other Physics Topics
IdentifiersURN: urn:nbn:se:liu:diva-132408DOI: 10.3384/diss.diva-132408ISBN: 9789176856789 (Print)OAI: oai:DiVA.org:liu-132408DiVA: diva2:1045464
2016-11-28, Planck, Fysikhuset, Campus Valla, Linköping, 11:15 (English)
Baranowski, Jacek, Professor
Darakchieva, Vanya, ProfessorYakimova, Rozitsa, ProfessorIvanov, Ivan Gueorguiev, Dr.
FunderSwedish Research Council, 2013−5580VINNOVA, 2011−03486Swedish Foundation for Strategic Research , FFL12−0181Swedish Foundation for Strategic Research , RIF14−055Linköpings universitet, LiU No2009 00971
Research Funders not listed under Research funders and strategic development areas: Marie Curie actions under the Project No.264613-NetFISiC, the centre of Nano Science and Nano technology (CeNano).2016-11-092016-11-092016-11-09Bibliographically approved
List of papers