The Performance of alloyed (CdS$_{0.33}$Se$_{0.67}$) quantum dots-sensitized TiO$_2$ solar cell

The performance of alloyed CdS$_{0.33}$Se$_{0.67}$ quantum dots-sensitized solar cells (QDSSCs) is studied. Fluorine doped Tin Oxide (FTO) substrates were coated with 20 nm-diameter TiO$_2$ nanoparticles (NPs). Presynthesized CdS$_{0.33}$Se$_{0.67}$ quantum dots (QDs) (radius 3.1 nm) were deposited onto TiO$_2$ nanoparticles (NPs) using direct adsorption (DA) method, by dipping for different times at ambient conditions. The FTO counter electrodes were coated with platinum, while the electrolyte containing $I^-/I^-_3$ redox species was sandwiched between the two electrodes. The characteristic parameters of the assembled QDSSCs were measured at different dipping times, under AM 1.5 sun illuminations. The maximum values of short circuit current density $(J_{\mathrm{sc}})$ and conversion efficiency $(\eta)$ are 1.115 mA/cm$^2$ and 0.25% respectively, corresponding 6 h dipping time. Furthermore, the Jsc increases linearly with increasing the intensities of the sun light which indicates the linear response of the assembled cells.