Abstract
ABSTRACTWe report on the effects of surface-modified TiO2 on the open-circuit voltage (Voc) of dye-sensitized solar cells (DSSCs). The TiO2 films were immersed into an aqueous zinc sulfate (ZS) solution to give ZS-modified photoelectrodes. The DSSCs with ZS-modified photoelectrodes showed a considerable improvement in Voc, compared to that of the control device with pristine TiO2 layer. By monitoring open-circuit voltage decay, electrochemical impedance and dark current, it was revealed that the modification of the TiO2 surface by ZS led to a longer electron lifetime due to a reduction of interfacial charge recombination between photo-injected electrons and I−3 ions, and thereby inducing the increase in Voc.
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