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Fig. 19 Scheme of the preparation of reduced graphene oxide with Cu 2 S nanocomposite for
applications as counter electrode material in QDSSCs (Reprinted permission with Radich et al.
[ 160 ])
Fig. 20 Recombination resistance of bare mesoporous electrode of TiO 2 and three sensitized
TiO 2 electrodes. Electrodes have been sensitized with the molecular dye N719 and with two
inorganic semiconductors CdS and Sb 2 S 3 . Recombination resistance has been measured with
impedance spectroscopy in three electrode configuration with liquid electrolyte. Recombination
resistance is inversely proportional to the recombination rate and it is plotted as function of the
equivalent conduction band potential, V ecb , where the shift of the conduction band [ 188 ] of the
different electrodes has been removed (Reprinted permission with Boix et al. [ 189 ])
absorber. This fact highlights the last of the five aspect in which QDSSCs shows
sensible differences with DSSCs. In Fig. 19 recombination resistance, R rec , of TiO 2
electrodes bare or sensitized with different materials is depicted. Note that the
recombination is reduced, in comparison with bare TiO 2 , when the electrode is
sensitized with the molecular dye N719, as the molecule acts as a blocking layer
for the recombination of electrons in TiO 2 . In contrast, only a slight decrease in
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