In this work, the preparation and photovoltaic conversion characterization of 10 μm films of sensitized TiO2 is
reported. The 13 nm TiO2 nanocrystals with anatase crystalline phase were deposited on an FTO substrate
and decorated with Au nanocrystals and sensitized with CdSe Quantum dots (QD) and poly(3-octylthiophene)
(P3OT) in different configurations. The photocurrent was measured in a three electrode electrochemical cell. The
results exhibited that TiO2/Au/QD/P3OT films have the largest photocurrent, giving approximately fivefold
the photocurrent of TiO2 films sensitized only with QD and near sevenfold the photocurrent of Au decorated
TiO2 films. These results are attributed to the ability of the Au nanocrystals to extract electrons from QD and
the photogeneration and hole transport of P3OT. Both phenomena combined with the QD's photogeneration
give a great amount of electrons that increase the photocurrent generation.
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