In this study, cadmium sulfide (CdS) and cadmium selenide (CdSe) quantum dots (QDs) were used as sensitizers of dye-sensitized solar cells (DSSCs). This two QDs were sequentially assembled onto a nanocrystalline TiO2 film, using a chemical bath deposition (CBD) method, to prepare a CdS/CdSe co-sensitized photoelectrode for QDs-sensitized solar cell application. Al2O3 and SiO2 were used as insulating layersto enhance the performance of QDs-DSSCs are studied. The results showed that CdS and CdSe QDs have complementary effect in the light harvest, but the performance of a QDs co-sensitized solar cell is strongly dependent on the order of CdS and CdSe respected to the TiO2. In the cascade structure of TiO2/CdS/CdSe electrode, the presence of Al2O3 and SiO2 insulating layer between CdS and CdSe can increase the performance of the QD-DSSCs. It is found that more QD can be incorporated onto the TiO2 thin films due to the surface treatment of Al2O3 and SiO2, which is advantageous to increase the light harvest range of the cell. Futhermore, the presence of Al2O3 and SiO2 can also inhibit the recombination of injected electrons to the electrolyte. It is also found that appropriate heat treatment (300oC,2 minutes) to the TiO2/CdS before assembly of CdSe can improve the performance and stability of the photoelectrode. The best energy conversion of the QD-DSSCs achieved in this study is 3.27%, obtained for the ITO/TiO2/CdS(4)/300oC/CdSe(5) electrode. By introducing of Al2O3 layer between CdS and CdSe, the efficiency can be increased to 3.4%.

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