The role of surface vibrations and quantum confinement effect to the optical properties of very thin nanocrystalline silicon films
Date
2007Author
Lioudakis, Emmanouil E.Antoniou, Antreas
Othonos, Andreas S.
Christofides, Constantinos
Nassiopoulou, Androula Galiouna
Lioutas, Ch B.
Frangis, N.
ISSN
0021-8979Source
Journal of Applied PhysicsVolume
102Issue
8Pages
83534-83534Google Scholar check
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We report on a spectroscopic study of very thin nanocrystalline silicon films varying between 5 and 30 nm. The role of quantum confinement effect and surface passivation of nanograins in optical properties are examined in detail. The coupling between surface vibrations and fundamental gap E-g as well as the increase of interaction between them at the strong confinement regime (<= 2 nm) are proposed for the observable pinning of E-g in luminescence measurements. (C) 2007 American Institute of Physics.