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The role of quantum confinement and surface chemistry in silicon nanocrystals at the strong confinement regime

✍ Scribed by Sa'ar, A. ;Dovrat, M. ;Jedrzejewsky, J. ;Popov, I. ;Balberg, I.

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
246 KB
Volume
204
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

Using infrared photo‐induced absorption (PIA) spectroscopy, we have found a remarkable correlation between inter‐sub‐level (ISL) optical transitions and the photoluminescence (PL) from silicon nanocrystals. Our results indicate that the quantized electronic sublevels of the nanocrystals are resonantly coupled to surface vibrational modes via a polarization field produced by coherent longitudinal polar vibrations. The model and the experimental results support our findings that the mechanism responsible for the efficient PL from silicon nanocrystals should be assigned to inhibition of nonradiative channels rather than enhancement of radiative transitions. (Β© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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