Direct bandgap optical transitions in Si nanocrystals
| Authors |
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|---|---|
| Publication date | 2009 |
| Journal | JETP Letters |
| Volume | Issue number | 90 | 12 |
| Pages (from-to) | 758-762 |
| Organisations |
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| Abstract | 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 Γ-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. |
| Document type | Article |
| Published at |
https://doi.org/10.1134/S0021364009240059
(Final published version)
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