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Página principal > Artículos > Artículos publicados > Electrical and Thermal Transport in Coplanar Polycrystalline Graphene-hBN Heterostructures |
Fecha: | 2017 |
Resumen: | 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. |
Ayudas: | Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-301 European Commission 615132 European Commission 604391 Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad FIS2015-64886-C5-3-P Ministerio de Economía y Competitividad MAT2012-33911 |
Derechos: | Tots els drets reservats. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió acceptada per publicar |
Materia: | Boron nitride ; Chemical vapor deposition ; Electrical properties ; Grain boundary ; Polycrystalline graphene ; Thermal properties ; Thermoelectrics |
Publicado en: | Nano letters, Vol. 17 Núm. 3 (March 2017) , p. 1660-1664, ISSN 1530-6992 |
Post-print 25 p, 7.5 MB |