The Band Gap in Silicon Nanocrystallites

Details The Band Gap in Silicon Nanocrystallites The Band Gap in Silicon Nanocrystallites

2001-07-21

arxiv.org/abs/cond-mat/0107451v1

Physics

Condensed Matter

5 pages, latex, 2 figures. (Submitted Physical Review B)

Scientific paper

10.1088/0953-8984/14/26/305

The gap in semiconductor nanocrystallites has been extensively studied both theoretically and experimentally over the last two decades. We have compared a recent ``state-of-the-art'' theoretical calculation with a recent ``state-of-the-art'' experimental observation of the gap in Si nanocrystallite. We find that the two are in substantial disagreement, with the disagreement being more pronounced at smaller sizes. Theoretical calculations appear to over-estimate the gap. Recognizing that the experimental observations are for a distribution of crystallite sizes, we proffer a phenomenological model to reconcile the theory with the experiment. We suggest that similar considerations must dictate comparisons between the theory and experiment vis-a-vis other properties such as radiative rate, decay constant, absorption coefficient, etc.

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