Density-functional study of SinCn (n = 10–15) clusters
State Key Laboratory of Silicon Materials and Department of Physics, Zhejiang University, Hangzhou, 310027, P.R. China
Corresponding author: a email@example.com
Revised: 13 April 2010
Published online: 19 May 2010
Density-functional theory with generalized gradient approximation for the exchange-correlation potential has been used to calculate the structural and electronic properties of SinCn (n = 10–15) clusters. We find that the SinCn clusters prefer cagelike structures. An extensive isomer search shows that the lowest-energy arrangements are those in which the silicon atoms and the carbon atoms form two distinct subunits. It is found that the carbon atoms favor to form fullerene-like structure due to the sp2-like bond. The silicon atoms are trying to cope with an unfavorable sp2 environment, but distorted tetrahedra still show up somewhere of the cagelike structures. On the basis of the lowest-energy geometries obtained, the binding energy, HOMO–LUMO gap, Mulliken charge, ionization potential and electron affinity of the clusters have been computed and analyzed. An electronic charge transfer from the Si-populated to the C-populated regions is observed.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010