%0 Journal Article
%T Buffer layers inhomogeneity and coupling with epitaxial graphene unravelled by Raman scattering and graphene peeling
%+ Laboratoire Charles Coulomb (L2C)
%+ Institut des Matériaux Jean Rouxel (IMN)
%+ Annealsys (Annealsys)
%A Wang, Tianlin
%A Huntzinger, Jean-Roch
%A Bayle, Maxime
%A Roblin, Christophe
%A Decams, Jean-Manuel
%A Zahab, Ahmed-Azmi
%A Contreras, Sylvie
%A Paillet, Matthieu
%A Landois, Périne
%< avec comité de lecture
%@ 0008-6223
%J Carbon
%I Elsevier
%V 163
%P 224-233
%8 2020-03-10
%D 2020
%R 10.1016/j.carbon.2020.03.027
%K Buffer layer
%K Graphene
%K Raman sectroscopy
%K Mechanical peeling
%K buffer layer
%K graphene
%K mechanical peeling
%Z Physics [physics]
%Z Environmental Sciences
%Z Engineering Sciences [physics]
%Z Chemical SciencesJournal articles
%X The so-called buffer layer (BL) is a carbon rich reconstructed layer formed during SiC (0001) sublimation.The covalent bonds between some carbon atoms in this layer and underlying silicon atoms makes itdifferent from epitaxial graphene. We report a systematical and statistical investigation of the BLsignature and its coupling with epitaxial graphene by Raman spectroscopy. Three different BLs arestudied: bare buffer layer obtained by direct growth (BL0), interfacial buffer layer between graphene andSiC (c-BL1) and the interfacial buffer layer without graphene above (u-BL1). To obtain the latter, wedevelop a mechanical exfoliation of graphene by removing an epoxy-based resin or nickel layer. The BLsare ordered-like on the whole BL growth temperature range. BL0 Raman signature may vary from sampleto sample but forms patches on the same terrace. u-BL1 share similar properties with BL0, albeit withmore variability. These BLs have a strikingly larger overall intensity than BL with graphene on top. Thesignal high frequency side onset upshifts upon graphene coverage, unexplainable by a simple straineffect. Two fine peaks (1235, 1360 cm1), present for epitaxial monolayer and absent for BL and transferred graphene. These findings point to a coupling between graphene and BL.
%G English
%2 https://hal.science/hal-03034438/document
%2 https://hal.science/hal-03034438/file/Carbon%20Buffer%202020.pdf
%L hal-03034438
%U https://hal.science/hal-03034438
%~ SDE
%~ UNIV-NANTES
%~ CNRS
%~ IMN
%~ L2C
%~ GIP-BE
%~ INC-CNRS
%~ MIPS
%~ UNIV-MONTPELLIER
%~ TEST-HALCNRS
%~ NANTES-UNIVERSITE
%~ UNIV-NANTES-AV2022
%~ UM-2015-2021
%~ TEST2-HALCNRS