中文摘要：

In this work,a three-layer TiO2 composite film consisting of flower-like TiO2 （Flo-TiO2 ）as overlayer,TiO2 nanotube arrays as interlayer and TiO2 nanoparticle（P25）as underlayer was fabricated as the photoelectrode of dyesensitized solar cells（DSSCs）.Due to the introduction of Flo-TiO2 ,the three-layer composite film has strong lightscattering ability.Then,we have investigated and compared the photoelectric conversion properties of DSSCs based on three-layer structure（P25/TNT arrays/Flo-TiO2 ）photoelectrode and double-layer film（P25/TNT arrays）photoelectrode.It is found that DSSCs based on three-layer structure exhibit a high power conversion efficiency of 6.48%compared with the DSSCs composed of double-layer film（5.11%）.

英文摘要：

In this work, a three-layer TiO2 composite film consisting of flower-like TiO2 （Flo-TiO2） as overlayer, TiOa nanotube arrays as interlayer and TiO2 nanoparticle （P25） as underlayer was fabricated as the photoelectrode of dyesensitized solar cells （DSSCs）. Due to the introduction of Flo-TiO2, the three-layer composite film has strong lightscattering ability. Then, we have investigated and compared the photoelectric conversion properties of DSSCs based on three-layer structure （P25/TNT arrays/Flo-TiO2） photoelectrode and double-layer film （P25/TNT arrays） photoelectrode. It is found that DSSCs based on three-layer structure exhibit a high power conversion efficiency of 6.48% compared with the DSSCs composed of double-layer film （5.11%）.