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Poster communications

Flowered graphene: Growth, charge and thermal transport

Abstract : Flower defects are the smallest dislocation loops observable in graphene. In this contribution [1], we illustrate their structural and transport properties investigated by means of high-resolution transmission electron microscopy and multiscale simulation tools based on density functional theory, Green’s functionsand Boltzmann transport equation. On the basis of our experimental images, we propose that flower defects are the grains left overby a bulge-type mechanism during the dynamic recrystallization of CVD graphene [2]. In order to explore their properties and the potential applications, we simulate electron and phonon transport in large graphene samples with different densities of flowers. At large densities, an energy-filtering effect is observed, with an almost unaffected hole transport and a significantly suppressed electron transport. This asymmetry originates from the flower-broken sublattice symmetry. For the same flower densities, heat transport is strongly decreased as a consequence of the dominant elastic scattering induced by the defects. Interestingly, even for low flower concentrations, the contribution of flexural phonons, which is significant in pristine graphene, is largely suppressed. [1] A. Cresti et al., Carbon161, 256 (2020) [2] A. Tyurnina et al., Carbon 102, 499 (2016)
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https://hal.archives-ouvertes.fr/hal-03002190
Contributor : Alessandro Cresti <>
Submitted on : Thursday, November 12, 2020 - 4:55:25 PM
Last modification on : Saturday, March 13, 2021 - 3:15:43 AM
Long-term archiving on: : Saturday, February 13, 2021 - 8:10:17 PM

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Alessandro Cresti, Jesús Carrete, Hanako Okuno, Wang Tao, Georg K.H. Madsen, et al.. Flowered graphene: Growth, charge and thermal transport. Graphene 2020, Oct 2020, online, France. ⟨hal-03002190⟩

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