Resonant coupling between surface vibrations and electronic states in silicon nanocrystals at the strong confinement regime

A Sa'ar; Y Reichman; M Dovrat; D Krapf; J Jedrzejewski; I Balberg

doi:10.1021/nl051740e

Resonant coupling between surface vibrations and electronic states in silicon nanocrystals at the strong confinement regime

Nano Lett. 2005 Dec;5(12):2443-7. doi: 10.1021/nl051740e.

Authors

A Sa'ar¹, Y Reichman, M Dovrat, D Krapf, J Jedrzejewski, I Balberg

Affiliation

¹ Racah Institute of Physics and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

PMID: 16351194
DOI: 10.1021/nl051740e

Abstract

A striking correlation between infrared photoinduced absorption spectra and the photoluminescence from silicon nanocrystals indicates that quantized electronic sublevels of the nanocrystals are resonantly coupled to surface vibrational modes via a polarization field produced by coherent longitudinal polar vibrations. Our experimental results and model support the assumption that the mechanism responsible for the efficient photoluminescence from silicon nanocrystals should be assigned to inhibition of nonradiative channels rather than enhancement of radiative channels.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Computer Simulation
Crystallization / methods*
Electric Conductivity
Electrochemistry / methods*
Electronics
Luminescence
Macromolecular Substances / chemistry
Materials Testing
Models, Chemical*
Models, Molecular*
Molecular Conformation
Nanostructures / chemistry*
Silicon / chemistry*
Vibration

Substances

Macromolecular Substances
Silicon