Scaling properties of charge transport in polycrystalline graphene
Dinh, Van Tuan (Institut Català de Nanociència i Nanotecnologia)
Kotakoski, Jani (Universität Wien. Faculty of Physics)
Louvet, Thibaud (Institut Català de Nanociència i Nanotecnologia)
Ortmann, Frank (Institut Català de Nanociència i Nanotecnologia)
Meyer, Jannik C. (Universität Wien. Faculty of Physics)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Date:	2013
Abstract:	Polycrystalline graphene is a patchwork of coalescing graphene grains of varying lattice orientations and size, resulting from the chemical vapor deposition (CVD) growth at random nucleation sites on metallic substrates. The morphology of grain boundaries has become an important topic given its fundamental role in limiting the mobility of charge carriers in polycrystalline graphene, as compared to mechanically exfoliated samples. Here we report new insights to the current understanding of charge transport in polycrystalline geometries. We created realistic models of large CVD-grown graphene samples and then computed the corresponding charge carrier mobilities as a function of the average grain size and the coalescence quality between the grains. Our results reveal a remarkably simple scaling law for the mean free path and conductivity, correlated to atomic-scale charge density fluctuations along grain boundaries.
Note:	This is an open access article published under an ACS AuthorChoice License. See Standard ACS AuthorChoice/Editors' Choice Usage Agreement - https://pubs.acs.org/page/policy/authorchoice_termsofuse.html
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Polycrystalline graphene ; Grain boundaries ; Charge transport ; Mobility
Published in:	Nano letters, Vol. 13, issue 4 (April 2013) , p. 1730-1735, ISSN 1530-6992

DOI: 10.1021/nl400321r
PMID: 23448361

6 p, 3.1 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles