Improving the efficiency of QDSSCs Based on TiO2/CdS(Silar)/TBAI capped CdSe (Colloid) Photoanodes

CdS/CdSe co-sensitized photoelectrode for QD-sensitized solar cell (QDSSCs)has been prepared.CdSis synthesized using successive ionic layer adsorption and reaction (silar), whileCdSehas been synthesized by organometallic method. The TOPO and HDA capping of CdSe QDs has been modified to be Tetrabutylammonium iodide (TBAI) in order to decrease the CdSe-TiO2 molecular separation. The results show that the short current density increased from 2.1 mA/cm2for (CdS-Silar) to 3.75 mA/cm2 for (CdS-Silar/CdSe–TBAI).This increase is due to the higher conduction band (CB) of the CdSe QDs than TiO2 and CdS (silar). An energy conversion efficiency of 0.92% is achievedby using TiO2/CdS/CdSephotoanode.