Due to their high light absorption, size dependent bandgap and low material usage and low cost of fabrication, quantum
dots (QDs) are a close second to the conventionally used dyes for the dye-sensitised solar cells (DSCs). TiCl4 treatment
is one of the typical methods used to treat the anode or the working electrode of DSCs for performance improvement. In
this work, the effect of TiCl4 treatment on the performance of CdSe/CdS-sensitised solar cells was studied. The devices
made without TiCl4 treatment, perform with a moderate 1.83% efficiency under AM1.5, 1 sun illumination conditions. In
contrast, TiCl4 treated working electrodes helps to enhance the cell efficiency to 3.98%, mainly from a higher
photocurrent density (15.4 mAcm-2) and fill factor (0.51). Higher loading of the quantum dots in the working electrode
and passivation effect due to TiCl4 treatment are believed to be responsible performance improvement.