Direct Bandgap Optical Transitions in Si Nanocrystals

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The effect of quantum confinement on the direct bandgap of spherical Si nanocrystals has been modelled theoretically. We conclude that the energy of the direct bandgap at the Gamma-point decreases with size reduction: quantum confinement enhances radiative recombination across the direct bandgap and introduces its "red" shift for smaller grains. We postulate to identify the frequently reported efficient blue emission (F-band) from Si nanocrystals with this zero-phonon recombination. In a dedicated experiment, we confirm the "red" shift of the F-band, supporting the proposed identification.
Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
Issue Date
2009-12
Language
English
Article Type
Article
Citation

JETP LETTERS, v.90, no.12, pp.758 - 762

ISSN
0021-3640
DOI
10.1134/S0021364009240059
URI
http://hdl.handle.net/10203/261899
Appears in Collection
PH-Journal Papers(저널논문)
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