Effects of characteristics on the photoelectric properties of TiO2 nanotube array

摘要

In present study,we investigated the photoelectric properties of TiO2 nanotube array films which were fabricated by electrochemical anodization on Ti metal substrates.The effects of annealing temperature and reaction conditions on the solid state conductivity of TiO2 nanotubes were explored.The samples were characterized by X-ray diffraction,scanning electron microscopy and Xray photoelectron spectroscopy.The photoelectrochemical response of the TiO2 nanotube array is studied under UV illumination by transient photoresponse technique in a three-electrode system.The results show that enlarging the nanotube diameter could decrease the transition time and the resistance of carrier,which resulting in improving the photo-generated current.Our research indicates that the less fluorinion residues on the nanotube array,the higher transient photovoltage and photocurrent.In addition,the TiO2 nanotube array mainly composed of anatase could improve the photoelectric conversion properties.The findings are very significant in view of an optimized use of TiO2 nanotubes in electrical and photo electric applications.