In recent years, the nanostructure for solar cells have attracted considerable attention from scientists as a result of a promising candidate for low cost devices. In this work, quantum dots sensitized solar cells with effective performance based on a co-sensitized CdS/CdSe:Mn2+ (or Cu2+) nanocrystal, which was made by successive ionic layer absorption and reaction, are discussed. The optical, physical, chemical, and photovoltaic properties of quantum dots sensitized solar cells were sensitized to Mn2+ and Cu2+ dopants. Therefore, the short current (JSC) of the quantum dot sensitized solar cells is boosted dramatically from 12.351 mA/cm2 for pure CdSe nanoparticles to 18.990 mA/cm2 for Mn2+ ions and 19.915 mA/cm2 for Cu2+ ions. Actually, metal dopant extended the band gap of pure CdSe nanoparticles, reduced recombination, enhanced the efficiency of devices, and improved the charge transfer and collection. In addition, Mn2+ and Cu2+ dopants rose to the level of the conduction band of pure CdSe nanoparticles, which leads to the reduction of the charge recombination, enhances the light-harvesting efficiency, and improves the charge diffusion and collection. The results also were confirmed by the obtained experimental data of photoluminescence decay and electrochemical impedance spectroscopy.
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