Web of Science: 21 citations, Scopus: 23 citations, Google Scholar: citations,
Electrical and Thermal Transport in Coplanar Polycrystalline Graphene-hBN Heterostructures
Barrios-Vargas, José Eduardo (Institut Català de Nanociència i Nanotecnologia)
Mortazavi, Bohayra (Bauhaus-Universität Weimar (Alemanya))
Cummings, Aron W. (Institut Català de Nanociència i Nanotecnologia)
Martínez Gordillo, Rafael (Aix-Marseille Université (França))
Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia)
Colombo, Luciano (Institut Català de Nanociència i Nanotecnologia)
Rabczuk, Timon (Bauhaus-Universität Weimar (Alemanya))
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Date: 2017
Abstract: We present a theoretical study of electronic and thermal transport in polycrystalline heterostructures combining graphene (G) and hexagonal boron nitride (hBN) grains of varying size and distribution. By increasing the hBN grain density from a few percent to 100%, the system evolves from a good conductor to an insulator, with the mobility dropping by orders of magnitude and the sheet resistance reaching the MΩ regime. The Seebeck coefficient is suppressed above 40% mixing, while the thermal conductivity of polycrystalline hBN is found to be on the order of 30-120 Wm K. These results, agreeing with available experimental data, provide guidelines for tuning G-hBN properties in the context of two-dimensional materials engineering. In particular, while we proved that both electrical and thermal properties are largely affected by morphological features (e. g. , by the grain size and composition), we find in all cases that nanometer-sized polycrystalline G-hBN heterostructures are not good thermoelectric materials.
Note: Número d'acord de subvenció AGAUR/2014/SGR-301
Note: Número d'acord de subvenció EC/FP7/615132
Note: Número d'acord de subvenció EC/FP7/604391
Note: Número d'acord de subvenció MINECO/SEV-2013-0295
Note: Número d'acord de subvenció MINECO/FIS2015-64886-C5-3-P
Note: Número d'acord de subvenció MINECO/MAT2012-33911
Rights: Tots els drets reservats.
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: Boron nitride ; Chemical vapor deposition ; Electrical properties ; Grain boundary ; Polycrystalline graphene ; Thermal properties ; Thermoelectrics
Published in: Nano Letters, Vol. 17 Núm. 3 (March 2017) , p. 1660-1664, ISSN 1530-6992

DOI: 10.1021/acs.nanolett.6b04936


Post-print
25 p, 7.5 MB

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 2018-07-11, last modified 2019-04-08



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