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

Zhiwen Yang; Bin Wen; Melnik, Roderick; Yao, Shan; Li, Tingju
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p192101
Academic Journal
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 I-V 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 I-V 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.


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