Geometry dependent current-voltage characteristics of ZnO nanostructures: A combined nonequilibrium Green's function and density functional theory study

Yang, Z.W., Wen, B., Melnik, R., Yao, S., Li, T.J.

Applied Physics Letters, 95 (19), 192101, 2009

Abstract:

Current-voltage (I-V) characteristics of different ZnO nanostructures were studied using a combined nonequilibrium Green's function and density functional theory techniques with the two-probe model. It was found that IN characteristics of ZnO nanostructures depend strongly on their geometry. For wurtzite ZnO nanowires, currents decrease with increasing lengths under the same applied voltage conditions. The IN characteristics are similar for single-walled ZnO nanotubes and triangular cross section ZnO nanowires but they are different from I-V characteristics of hexagonal cross section ZnO nanowires. Finally, our results are discussed in the context of calculated transmission spectra and densities of states.