Excitons in Silicon Nanocrystalites: The Nature of Luminescence

Details Excitons in Silicon Nanocrystalites: The Nature of Luminescence Excitons in Silicon Nanocrystalites: The Nature of Luminescence

2007-07-20

arxiv.org/abs/0707.3113v1

Physical Review B 75, 033303 (2007)

Physics

Condensed Matter

Materials Science

12 pages 4 figures

Scientific paper

10.1103/PhysRevB.75.033303

The absorption and emission spectra of silicon nanocrystals up to 1 nm diameter including geometry optimization and the many-body effects induced by the creation of an electron-hole pair have been calculated within a first-principles framework. Starting from hydrogenated silicon clusters of different size, different Si/O bonding at the cluster surface have been considered. We found that the presence of a Si-O-Si bridge bond originates significative excitonic luminescence features in the visible range that are in fair agreement with the experimental outcomes.

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