Delocalized image surface states in defects free SiO2 hollow nanospheres
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Altres documents de l'autoria: Movilla, Jose L.; Rajadell Viciano, Fernando; Planelles, Josep
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Delocalized image surface states in defects free SiO2 hollow nanospheresData de publicació
2008Editor
American Institute of PhysicsISSN
00218979Tipus de document
info:eu-repo/semantics/articleVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
Delocalized image surface states in free-standing hollow silica nanospheres populated with one or
two electrons or an exciton are theoretically predicted for a wide range of internal radii and shell
thicknesses. The ... [+]
Delocalized image surface states in free-standing hollow silica nanospheres populated with one or
two electrons or an exciton are theoretically predicted for a wide range of internal radii and shell
thicknesses. The driving force building up these surface states is the image self-polarization
potential originating from the dielectric mismatch between the nanoshell and the surrounding air.
The surface states are localized in a spherical crown beyond the nanoshell border. The transition
from volume to surface state will then have to overcome the spatial confining potential barrier of the
nanoshell. Owing to the different spatial confining barriers of electrons and holes in the silica
nanoshell, electron but no hole density can be concentrated in surface distributions. The
self-polarization potential looks like a double well potential, each well located just beyond the
nanoshell border, with the internal well deeper than the external one, so that an excess carrier is
attracted more strongly by the inner interface. This leads the electron density of a surface state to be
located mainly in the internal surface of the hollow nanosphere. The shorter the inner nanoshell
radius is, the stronger the binding of the excess electron to the surface will be. The volume/surface
ground state phase diagrams of the one-electron, two-electron, and exciton systems have been
calculated. All three diagrams are quite similar, thus revealing the monoelectronic character of the
driving force for the transition from volume to surface states [-]
Drets d'accés
Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in MOVILLA ROSELL, José Luis. Delocalized image surface states in defects free SiO2 hollow nanospheres, 2008, núm. 103, and may be found at http://adsabs.harvard.edu/abs/2008JAP...103a4310M
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