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Experiments and Monte Carlo Simulations on the Recombination Dynamics in Porous Silicon

Published online by Cambridge University Press:  28 February 2011

L. Pavesi  and
H. Eduardo Roman
L. Pavesi
Affiliation:
Dip. di Fisica, Università di Trento, via Sommarive 14,1-38050 Povo, Italy
H. Eduardo Roman
Affiliation:
Institut für Theoretische Physik, Universität Giessen, Heinrich-Buff-Ring 16, D-35392Giessen, Germany
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Abstract

We present a detailed study of the time-resolved photo-luminescence of porous Silicon samples with different porosities providing clear evidence of anomalous relaxation behaviour of the luminescence, which follows stretched exponential decay for a variety of experimental conditions. In addition, a numerical study of the underlying transport behaviour in these disordered materials by means of Monte-Carlo simulations has been performed. Nanometer sized particles, characterised by a distribution of radiative and non-radiative recombination times, are randomly placed at the sites of a cubic lattice forming a single three dimensional percolation cluster. Charge carriers are allowed to hop between nearest-neighbour occupied sites. The competing effect between radiative and non-radiative transitions in a single nanometer particle, as well as the effects of geometrical constraints on transport due to the complex topology, are discussed and compared to experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 549
Copyright
Copyright © Materials Research Society 1995

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References

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