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Surface defect states control ultrafast electron injection in dye/semiconductor colloidal systems

Robert Huber, Sebastian Spörlein, Josef Wachtveitl, Jacques E. Moser, and Michael Grätzl

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Abstract

Electron injection from photoexcited dye molecules into semiconductor colloidal particles (TiO2 and ZrO2) is investigated by femtosecond spectroscopy. Ultrafast reaction dynamics in the dye / ZrO2-system with an inaccessible conduction band demonstrates efficient electron transfer to surface defect states.

© 2000 Optical Society of America

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