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Multi-scale investigation of interface properties, stacking order and decoupling of few layer graphene on C-face 4H-SiC
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Lund University, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-1000-0437
CNR IMM, Italy.
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2017 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 116, 722-732 p.Article in journal (Refereed) Published
Abstract [en]

In this work, we report a multi-scale investigation using several nano-, micro and macro-scale techniques of few layer graphene (FLG) sample consisting of large monolayer (ML) and bilayer (BL) areas grown on C-face 4H-SiC (000-1) by high-temperature sublimation. Single 1 x 1 diffraction patterns are observed by micro-low-energy electron diffraction for ML, BL and trilayer graphene with no indication of out-of-plane rotational disorder. A SiOx layer is identified between graphene and SiC by X-ray photoelectron emission spectroscopy and reflectance measurements. The chemical composition of the interface layer changes towards SiO2 and its thickness increases with aging in normal ambient conditions. The formation mechanism of the interface layer is discussed. It is shown by torsion resonance conductive atomic force microscopy that the interface layer causes the formation of non-ideal Schottky contact between ML graphene and SiC. This is attributed to the presence of a large density of interface states. Mid-infrared optical Hall effect measurements revealed Landau-level transitions in FLG that have a square-root dependence on magnetic field, which evidences a stack of decoupled graphene sheets. Contrary to previous works on decoupled C-face graphene, our BL and FLG are composed of ordered decoupled graphene layers without out-of-plane rotation. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2017. Vol. 116, 722-732 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-136855DOI: 10.1016/j.carbon.2017.02.026ISI: 000397549300083OAI: oai:DiVA.org:liu-136855DiVA: diva2:1092115
Note

Funding Agencies|Marie Curie actions [264613-NetFISiC]; Swedish Research Council [2013-5580, 2016-00889]; Swedish Governmental Agency for Innovation Systems (VIN-NOVA) under the VINNMER international qualification program [2011-03486]; Swedish Foundation for Strategic Research (SSF) [FFL12-0181, RIF14-055]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]; FP7 EU project Nano-Rf [FP7-ICT- 2011-8]; European Union Seventh Framework Programme [604391]; National Science Foundation (NSF) through the Center for Nano hybrid Functional Materials [EPS-1004094]; Nebraska Materials Research Science and Engineering Center [DMR-1420645, CMMI 1337856, EAR 1521428]

Available from: 2017-04-30 Created: 2017-04-30 Last updated: 2017-04-30

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Bouhafs, ChamseddineIvanov, Ivan GueorguievEriksson, JensStanishev, ValleryKuhne, PhilippIakimov, TihomirHofmann, TinoSchubert, MathiasYakimova, RositsaDarakchieva, Vanya
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