Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-07-13
Journal of Physics and Chemistry of Solids 72, 1096 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 5 figures
Scientific paper
10.1016/j.jpcs.2011.06.011
We present a systematic study of the photo-absorption spectra of various Si$_{n}$H$_{m}$ clusters (n=1-10, m=1-14) using the time-dependent density functional theory (TDDFT). The method uses a real-time, real-space implementation of TDDFT involving full propagation of the time dependent Kohn-Sham equations. Our results for SiH$_{4}$ and Si$_{2}$H$_{6}$ show good agreement with the earlier calculations and experimental data. We find that for small clusters (n<7) the photo-absorption spectrum is atomic-like while for the larger clusters it shows bulk-like behaviour. We study the photo-absorption spectra of silicon clusters as a function of hydrogenation. For single hydrogenation, we find that in general, the absorption optical gap decreases and as the number of silicon atoms increase the effect of a single hydrogen atom on the optical gap diminishes. For further hydrogenation the optical gap increases and for the fully hydrogenated clusters the optical gap is larger compared to corresponding pure silicon clusters.
Auluck Sushil
Prasad Rajendra
Thingna Juzar
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