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Ultrafast photoinduced electron transfer in coumarin 343 sensitized TiO2-colloidal solution

Authors :
Josef Wachtveitl
Robert Huber
Sebastian Spörlein
Jacques E. Moser
Michael Grätzel
Source :
International Journal of Photoenergy, Vol 1, Iss 3, Pp 153-155 (1999)
Publication Year :
1999
Publisher :
Hindawi Limited, 1999.

Abstract

Photoinduced electron transfer from organic dye molecules to semiconductor nanoparticles is the first and most important reaction step for the mechanism in the so called “wet solar cells” [1]. The time scale between the photoexcitation of the dye and the electron injection into the conduction band of the semiconductor colloid varies from a few tens of femtoseconds to nanoseconds, depending on the specific electron transfer parameters of the system, e.g., electronic coupling or free energy values of donor and acceptor molecules [2–10]. We show that visible pump/ white light probe is a very efficient tool to investigate the electron injection reaction allowing to observe simultaneously the relaxation of the excited dye, the injection process of the electron, the cooling of the injected electron and the charge recombination reaction.

Subjects

Subjects :
Renewable energy sources
TJ807-830

Details

Language :
English
ISSN :
1110662X
Volume :
1
Issue :
3
Database :
Directory of Open Access Journals
Journal :
International Journal of Photoenergy
Publication Type :
Academic Journal
Accession number :
edsdoj.bedbe0fdc0a245e684f0eff718bedbee
Document Type :
article
Full Text :
https://doi.org/10.1155/S1110662X99000264