A novel approach for improving the power conversion efficiency of hybrid solar cells containing two active areas with ITO/ZnO /PbS QDs/P3HT/PCBM/Ag structure is presented, which PbS absorbs the NIR region and P3HT absorbs the visible light. Lead sulfide quantum dots (PbS QDs) were prepared by successive ion layer adsorption and reaction technique based on spin assisted coating (spin-SILAR). The effect of the number of SILAR cycle (n) on optical and photovoltaic properties of synthesized devices was studied. Optimized solar cell demonstrated maximum power conversion efficiency of 3.48% with short-circuit current of 10.10 mA/cm2 and open-circuit voltage of 0.61 V under 1 sun illumination (AM1.5).
