Improvement of dye-sensitized solar cell performance through infiltration of TiO2 nanoparticles between mesoporous TiO2 particles

Abstract

There are two factors on the efficiency of dye-sensitized solar cell (DSSC): one is the amount of dye adsorbed, and the other is contact resistance. In this study, TiO2 nanoparticles (nano-TiO2, about 20nm particle size) were infiltrated between mesoporous TiO2 (meso-TiO2) particles with about 300nm particle sizes, in order to reduce the contact resistance of TiO2 electrodes. The infiltrated nano-TiO2 can facilitate electron transfer between meso-TiO2 particles by filling the empty volume of DSSC electrodes. As a result, the TiO2 electrode containing 65wt% of meso-TiO2 and 35wt% of nano-TiO2 exhibited the highest performance of DSSC.