Excitonic and Quasiparticle Gaps in Si Nanocrystals
- 13 March 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 84 (11), 2457-2460
- https://doi.org/10.1103/PhysRevLett.84.2457
Abstract
We present calculations of the one- and two-particle excitations in silicon nanocrystals. The one-particle properties are handled in the approximation, and the excitonic gap is obtained from the Bethe-Salpeter equation. We develop a tight binding version of these methods to treat clusters up to 275 atoms. The self-energy and Coulomb corrections almost exactly cancel each other for crystallites with radius larger than 0.6 nm. The result of this cancellation is that one-particle calculations give quite accurate values for the excitonic gap of crystallites in the most studied range of sizes.
Keywords
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