A Composite Photoanode Based on P25/TiO2 Nanotube Arrays/ Flower-Like TiO2 for High-Efficiency Dye-Sensitized Solar Cells

摘要

In this work,a three-layer TiO_2 composite film consisting of flower-like TiO_2 (Flo-TiO_2 )as overlayer,TiO_2 nanotube arrays as interlayer and TiO_2 nanoparticle(P25)as underlayer was fabricated as the photoelectrode of dyesensitized solar cells(DSSCs).Due to the introduction of Flo-TiO_2 ,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-TiO_2 )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%).