Abstract: The single crystle TiO2 nanorod arrays gown on FTO substrate were prepared by hydrothermal method. The morphology, structure and photoelectric property were investigated with Scanning electron microscope (SEM), X-ray diffraction spectrum (XRD), ultraviolet-visible absorption spectrum (UV-Vis) and surface photovoltage spectrum (SPS) respectively. In the contraction of different arrays with different substrates we found that the FTO substrate had a decisive effect on the growth of nanorod arrays. The lattices of TiO2 seed layer and SnO2:F matched very well, which helped the epitaxial growth and the orientation of nanorod arrays. According to the Field induced surface photovoltage spectroscopy, there was a band upward bending in TiO2 nanorods at the interface of TiO2 and FTO. Introducing seed layer into the process of growth would help the orientation of array, decrease the interface state greatly and provide the potential to increase the collection efficiency of carrier.

Key words: TiO2 array, surface photovoltage spectrum, interface state, collection efficiency