Abstract
Porous TiO2 particles having a controlled pore size were synthesized from colloidal mixtures of TiO2 nanoparticles and polyethylene glycol (PEG) via an aerosol templating method. The effect of a PEG addition on the pore properties of the as-prepared porous TiO2 particles was systematically investigated. A larger amount of PEG led to porous TiO2 particles with higher specific surface areas and total pore volumes originating from the removal of the PEG during a heat treatment. Furthermore, the photovoltaic characteristics of dye-sensitized solar cells (DSSCs) fabricated with porous TiO2 photoanodes having different pore properties were estimated. The photovoltaic conversion efficiency of the DSSCs was found to be strongly dependent on the pore properties of the TiO2 photoanode. The DSSC fabricated with the TiO2 photoanode prepared with 0.25wt% of PEG showed the highest conversion efficiency of 6.17%, which was approximately 170% higher than that of DSSC fabricated with a TiO2 photoanode without PEG.
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