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Ultrafast relaxatio...
Abstract
Ämnesord
Stäng
- Ultrafast spectroscopy has been used to study the relaxation processes of charge carriers in ZnO nanocrystalline thin films. A broad red-IR absorption band linked to shallowly trapped electrons was observed by spectroelectrochemical measurements. Femtosecond transient absorption data revealed multiexponential decays of the charge carriers with time constants ranging from 1 to 400 ps. The decay profile of the signal shows a probe wavelength dependence. This effect is assigned to the trapping (localisation) of nonequilibrium charge carriers which occurs on a time scale of similar to1 ps. The recombination of shallowly trapped electrons with deeply trapped holes, determined by single-photon counting, mainly occurs in 400 ps.
Nyckelord
- diffuse-reflectance spectroscopy
- semiconductor nanoparticles
- femtosecond
- surface
- size
- photocatalysis
- nanoclusters
- photophysics
- colloids
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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