Enhanced surface-excitonic emission in ZnO/Al(2)O(3) core-shell nanowires.
Nanotechnology
; 19(30): 305202, 2008 Jul 30.
Article
em En
| MEDLINE
| ID: mdl-21828756
ABSTRACT
We report the influence of an Al(2)O(3) shell on the photoluminescence emission of ZnO nanowires. At room temperature, the spectrum of the core-shell nanowires shows a strong reduction of the relative intensity of the green defect emission with respect to the near-band-edge emission. At 5 K an increase of the relative intensity of the surface exciton band with respect to the donor-bound exciton emission is observed. Annealing the core-shell nanowires at 500 °C does not increase the green defect luminescence at 5 K. We propose a model explaining the spectral changes.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Nanotechnology
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Alemanha