Abstract
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). TiCl 4 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 TiCl 4 treatment on the performance of CdSe/CdS-sensitised solar cells was studied. The devices made without TiCl 4 treatment, perform with a moderate 1.83% efficiency under AM1.5, 1 sun illumination conditions. In contrast, TiCl 4 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 TiCl 4 treatment are believed to be responsible performance improvement.
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