Mobility in semiconducting graphene nanoribbons: Phonon, impurity, and edge roughness scattering
نویسندگان
چکیده
The transport properties of carriers in semiconducting graphene nanoribbons are studied by comparing the effects of phonon, impurity, and line-edge roughness scattering. It is found that scattering from impurities located at the surface of nanoribbons and from acoustic phonons are as important as line-edge roughness scattering. The relative importance of these scattering mechanisms varies with the temperature, Fermi-level location, and the width of the ribbons. Based on the analysis, strategies for improvement of low-field mobility are described.
منابع مشابه
Variability of bandgap and carrier mobility caused by edge defects in ultra-narrow graphene nanoribbons
We report the results of multi-scale modeling of ultra-narrow graphene nanoribbons (GNRs) that combines atomistic non-equilibrium Green’s function (NEGF) approach with semiclassical mobility modeling. The variability of the transport gap and carrier mobility caused by random edge defects is analyzed. We find that the variability increases as the GNR width is downscaled and that even the minimum...
متن کاملEdge effect on thermal transport in graphene nanoribbons: A phonon localization mechanism beyond edge roughness scattering
Equilibrium molecular dynamics simulations show that graphene nanoribbons (GNRs) with zigzag edges have higher thermal conductivity (j) than armchair-edged ones, and the difference diminishes with increasing temperature or ribbon width. The dominant phonon wavelength for thermal transport can be much longer (by orders of magnitude) than the difference between the “roughness” of smooth zigzag an...
متن کاملFull-band and atomistic study of electron-phonon interaction in graphene nanoribbons
Transmission function through metallic armchair-edge graphene nanoribbons is calculated within non-equilibrium Green’s function method including full-band electron–opticalphonon interaction. Structures appear in transmission function, which are originated in both zone-center and zone-edge optical-phonon scattering.
متن کاملSignificantly reduced thermal conductivity and enhanced thermoelectric properties of single- and bi-layer graphene nanomeshes with sub-10nm neck-width
When graphene is shrunk into ~10 nm scale graphene nanoribbons or nanomesh structures, it is expected that not only electrical properties but also thermal conductivity and thermoelectric property are significantly altered due to the quantum confinement effect and extrinsic phonon-edge scattering. Here, we fabricate large-area, sub10 nm singleand bilayer graphene nanomeshes from block copolymer ...
متن کاملElectronic transport properties of graphene nanoribbons
We will present brief overview on the electronic and transport properties of graphene nanoribbons focusing on the effect of edge shapes and impurity scattering. The low-energy electronic states of graphene have two non-equivalent massless Dirac spectrum. The relative distance between these two Dirac points in the momentum space and edge states due to the existence of the zigzag type graphene ed...
متن کامل