Abstract: The photo-generated charges characteristics of CdS/ZnO heterostructures materials have been studied by means of Surface photovoltage techniques. The results showed that the photovoltage intensities of CdS/ZnO heterostructures materials decresed comparing with that of CdS. From the results of transient photovoltage measurement, the photo-generated electrons of CdS could transferr to ZnO under illumination since an electric field formed on the interface between CdS and ZnO. But this field is too weak to dominate the photo-generated charges characteristics. This result indicates that photo-generated charges characteristics can be clarified furthermore by means of surface photovoltage phase and transient photovoltage techniques.

Key words: CdS/ZnO Heterostructures, surface photovoltage phase, Transient photovoltage, photo-generated charges transfer