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Transient Photocurrent Response of Dye-Sensitized Porous Nanocrys1Alline TiO2 Electrodes

Published online by Cambridge University Press:  15 February 2011

Albert Goossens ,
G. K. Boschloo  and
J. Schoonman
Albert Goossens
Affiliation:
Delft University of Technology, Laboratory for Applied Inorganic Chemistry, Julianalaan 136, 2628 BL Delft, The Netherlands, a.goossens@stm.tudelft.nl
G. K. Boschloo
Affiliation:
Delft University of Technology, Laboratory for Applied Inorganic Chemistry, Julianalaan 136, 2628 BL Delft, The Netherlands, a.goossens@stm.tudelft.nl
J. Schoonman
Affiliation:
Delft University of Technology, Laboratory for Applied Inorganic Chemistry, Julianalaan 136, 2628 BL Delft, The Netherlands, a.goossens@stm.tudelft.nl
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Abstract

In order to investigate the fundamentals of electron migration in nanostructured metal-oxide semiconductors, the transient photocurrent response of dye-sensitized porous nanocrystalline TiO2 is studied. The time-resolved photocurrent response at light steps or pulses shows a faster transient upon increasing the light intensity. Intensity-modulated photocurrent spectroscopy (IMPS) reveals that the transient photocurrent is dominated by two time constants, i.e. the geometrical one and a characteristic time related to electron trapping. A theoretical model is derived in which the occupation dynamics of a single electron trap is considered using Shockley-Read-Hall kinetics. The geometrical RC time of the electrode is also included. Excellent agreement between this model and the measured IMPS spectra is obtained.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 607
Copyright
Copyright © Materials Research Society 1997

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References

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