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Probing the nanoscale origin of strain and doping in graphene-hBN heterostructures
Vincent, Tom (National Physical Laboratory (United Kingdom))
Panchal, Vishal (Bruker Nano Surfaces)
Booth, Timothy J (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Power, Stephen R. (Institut Català de Nanociència i Nanotecnologia)
Jauho, Antti-Pekka (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Antonov, Vladimir (University of London. Royal Holloway)
Kazakova, Olga (National Physical Laboratory (United Kingdom))

Date: 2019
Abstract: We use confocal Raman microscopy and a recently proposed vector analysis scheme to investigate the nanoscale origin of strain and carrier concentration in exfoliated graphene-hexagonal boron nitride (hBN) heterostructures on silicon dioxide (SiO). Two types of heterostructures are studied: graphene on SiO partially covered by hBN, and graphene fully encapsulated between two hBN flakes. We extend the vector analysis method to produce separated spatial maps of the strain and doping variation across the heterostructures. This allows us to visualise and directly quantify the much-speculated effect of the environment on carrier concentration in graphene. Moreover, we demonstrate that variations in strain and carrier concentration in graphene arise from nanoscale features of the heterostructures such as fractures, folds and bubbles trapped between layers. For bubbles in hBN-encapsulated graphene, hydrostatic strain is shown to be greatest at bubble centres, whereas the maximum carrier concentration is localised at bubble edges. Raman spectroscopy is shown to be a non-invasive tool for probing strain and doping in graphene, which could prove useful for engineering of two-dimensional devices.
Note: Número d'acord de subvenció EC/H2020/785219
Note: Número d'acord de subvenció EC/H2020/665919
Note: Número d'acord de subvenció MINECO/SEV-2013-0295
Rights: Tots els drets reservats.
Language: Anglès.
Document: article ; recerca ; submittedVersion
Published in: 2D Materials, Vol. 6, issue 1 (Jan. 2019) , art. 15022, ISSN 2053-1583

DOI: 10.1088/2053-1583/aaf1dc


Preprint
15 p, 790.9 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2019-11-19, last modified 2019-12-23



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