Ultrafast studies of electron injection in Ru dye sensitized SnO2 nanocrystalline thin filmReport as inadecuate




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International Journal of Photoenergy - Volume 4 2002, Issue 1, Pages 17-20

Department of Physical Chemistry, Uppsala University, Box 532, Uppsala S-751 21, Sweden



Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

By using two-color femtosecond transient absorption spectroscopy, we have measured theelectron injection rate for bistetrabutylammonium cis dithiocyanato bis 2,2’-bypiridine-4,4’ carboxylicacidRuthenium II dye called N719 into SnO2 nanocrystalline thin films. The electron injection rate hasbeen measured by monitoring the formation of the dye oxidized state and the arrival of electrons in theconduction band. Dynamics of electron injection are multiexponential 0.2, 4 and 130 ps and are thereforeslower than the N719-ZnO or N719-TiO2 systems. The photocurrent action spectrum of N719-SnO2 shows a quantum efficiency of 0.65 at 530 nm proving that efficient charge separation can take place despite of therelatively slow electron injection rate.





Author: Christophe Bauer, Gerrit Boschloo, Emad Mukhtar, and Anders Hagfeldt

Source: https://www.hindawi.com/



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