Photoluminescence measurements of zero-phonon optical transitions in silicon nanocrystals
2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 84, no 12, 125326- p.Article in journal (Refereed) Published
Optical transitions in silicon nanocrystals with different surface passivations were probed at low temperatures on a single-particle level. A type of quasidirect recombination process, different from the quantum-confined exciton transition, is identified. The luminescence spectra have different emission energies, but the contribution of a no-phonon transition is significantly higher than expected from the quantum-confinement model. Its relative strength was found to be temperature dependent, suggesting spatial localization of excitons as a possible origin.
Place, publisher, year, edition, pages
American Physical Society , 2011. Vol. 84, no 12, 125326- p.
SI NANOCRYSTALS; LIGHT-EMISSION; QUANTUM DOTS; LASER
IdentifiersURN: urn:nbn:se:kth:diva-46184DOI: 10.1103/PhysRevB.84.125326ISI: 000295484300012ScopusID: 2-s2.0-80053926247OAI: oai:DiVA.org:kth-46184DiVA: diva2:453569
FunderSwedish Research Council
QC 201111032012-01-192011-11-022012-01-19Bibliographically approved