CdS quantum dots were coated on TiO2 layer by successive ionic layer adsorption and reaction method. An ecient photovoltaic energy conversion and signicant quantum-size eect were observed. The magnitude of the short-circuit photocurrent density JSC was found to be approximately 6.01 mA/cm 2 for graphene oxide-incorporated CdS/TiO2 solar cell, while the JSC of only CdS-sensitized solar cells was lower than 4.40 mA/cm 2 . The eciency of the CdS/TiO2 solar cell with a graphene oxide layer

more »

... g CdS QDs was 60% higher than that of the CdS/TiO2 solar cell. The cell eciency was remarkably improved with the graphene oxide-incorporation. The carrier recombination of the QDs sensitized solar cells based on CdS-coated TiO2 was signicantly suppressed due to photogenerated charge carrier transports resulting from the presence of graphene oxide.