Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1547897 | Physica E: Low-dimensional Systems and Nanostructures | 2007 | 6 Pages |
Abstract
Photoexcited carrier dynamics in thin CdSe nanocrystalline films prepared by chemical bath deposition are strongly dependent on the deposition parameters. In this paper, we show how an increase in concentration of CdSO4 in deposition bath affects the photoexcited carrier dynamics in nanocrystals. We used ultrafast absorption and photoluminescence laser spectroscopy to compare the carrier dynamics in samples prepared with and without increased CdSO4 concentration. We have found that in the Cd-rich samples the spectral dependences of both photoluminescence and absorption dynamics are considerably less pronounced and the dynamics are slower. The observed effects were explained by the suppression of surface mediated carrier relaxation due to the passivation of individual nanocrystals by cadmium hydroxide and/or by sulphatocomplexes of Cd2+.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Miroslav Å imurda, Petr NÄmec, FrantiÅ¡ek Trojánek, Karel Neudert, Tadaki Miyoshi, Kazuo Kasatani, Petr Malý,