Evaluating the Sources of Graphene's Resistivity Using Differential Conductance.

ABSTRACT: We explore the contributions to the electrical resistance of monolayer and bilayer graphene, revealing transitions between different regimes of charge carrier scattering. In monolayer graphene at low densities, a nonmonotonic variation of the resistance is observed as a function of temperature. Such behaviour is consistent with the influence of scattering from screened Coulomb impurities. At higher densities, the resistance instead varies in a manner consistent with the influence of scattering from acoustic and optical phonons. The crossover from phonon-, to charged-impurity, limited conduction occurs once the concentration of gate-induced carriers is reduced below that of the residual carriers. In bilayer graphene, the resistance exhibits a monotonic decrease with increasing temperature f

SUBMITTER: Somphonsane R 

PROVIDER: S-EPMC5583290 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature