This paper reports an inclusive study of synthesis and characterization of quantum dots CdS embedded Pb0.85La0.15TiO3 (PLT15) dielectric nanocomposite materials for application in thin-film quantum dots solar cells (QDSSc). We have synthesized dielectric materials which act as a strong field-effect passivation, screened columbic attraction, back reflector and recombination inhibitor for solar cell fabrication. This material was deposited on FTO/TiO2 layer with a uniform mixed layer of nanorod (CdS)-nanoparticles (PLT15) which result in an increase in the SCs efficiency by times higher from the reference value. By adding dielectric materials in a prototype solar cell, an enhancement of 6.32 mA/cm(2) in short-circuit current and an absolute value of 4.5% enhancement in overall conversion efficiency are achieved. In particular, synthesis of materials, fabrication, structural, optical, electrical and stability of the prototype SCs are examined thoroughly. We also performed a detailed investigation of aging on the main characteristics of solar cells, such as efficiency, fill factor, short circuit current and open circuit voltage. It was observed that due to its cost effectiveness, stability, and enhance efficiency, this dielectric based hybrid thin film solar cells have high potential to be applied in industry in the near future.