Paper Title:
Effects of Morphology on the Electronic Properties of Hydrogenated Silicon Carbide Nanowires
  Abstract

The effects on the electronic band structure of hydrogenated cubic silicon carbide (-SiC) nanowires of changes in the diameter and morphology are studied using a semiempirical sp3s* tight-binding approach applied to a supercell model. The results of the calculation of the electronic band structure and electronic density of states obtained are compared with those calculated by density functional theory within local density approximation only for the bulk of -SiC. As boundary conditions, we passivated all the Si and C dangling bonds with hydrogen atoms. The results show that although surface morphology modifies the band gap, the change is more systematic with the thickness variation. The energy band gap increases with decreasing diameter in all cases because of quantum confinement, but the scaling is dependent on the morphology (cross-section) of the -SiC nanowires. Finally, the calculations show a consistent asymptotical behavior to the crystalline limit when the width of the wires enlarges.

  Info
Periodical
Edited by
Guest Editor: Umapada Pal
Pages
161-167
DOI
10.4028/www.scientific.net/JNanoR.5.161
Citation
A. Miranda, J.L. Cuevas, A.E. Ramos, M. Cruz-Irisson, "Effects of Morphology on the Electronic Properties of Hydrogenated Silicon Carbide Nanowires", Journal of Nano Research, Vol. 5, pp. 161-167, 2009
Online since
February 2009
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