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The Luminescence Mechanism of Porous Silicon

Published online by Cambridge University Press:  28 February 2011

P. D. J. Calcott ,
K. J. Nash ,
L. T. Canham ,
M. J. Kane  and
D. Brumhead
P. D. J. Calcott
Affiliation:
Defence Research Agency (RSRE), St. Andrews Road, Malvern, Worcs. WR143PS, UK
K. J. Nash
Affiliation:
Defence Research Agency (RSRE), St. Andrews Road, Malvern, Worcs. WR143PS, UK
L. T. Canham
Affiliation:
Defence Research Agency (RSRE), St. Andrews Road, Malvern, Worcs. WR143PS, UK
M. J. Kane
Affiliation:
Defence Research Agency (RSRE), St. Andrews Road, Malvern, Worcs. WR143PS, UK
D. Brumhead
Affiliation:
Defence Research Agency (RSRE), St. Andrews Road, Malvern, Worcs. WR143PS, UK
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Abstract

We report resonantly excited photoluminescence (PL) spectroscopy of highly porous silicon. In the PL spectra we observe satellite structure due to the participation of momentum-conserving phonons in the optical transitions. The momentum-conserving role of these phonons, together with their energies and relative coupling strengths, demonstrate beyond doubt that crystalline silicon, which has already been shown to be the dominant constituent of unoxidised porous silicon, also forms the luminescent material. We show that the theory of quantum confinement in crystalline silicon wires can explain our results and those of other experiments, if the electron-hole interaction, andthe localisation of carriers by fluctuations in wire width, are taken into account.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 283: Symposium F – Microcrystalline Semiconductors–Materials Science and Devices , 1992 , 143
Copyright
Copyright © Materials Research Society 1993

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References

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