The Application Of TiO₂with Different Morphologies In DSSCs

Dye-sensitized solar cells (DSSCs) have attracted much attention because of their low cost, possible fabrications of flexible devices, and relatively efficient devices for the photovoltaic conversion of solar energy. Dye sensitized solar cell is a typical sandwich structure of battery consisting of a nanocrystalline TiO2film covered by a monolayer of dye molecules, redox electrolyte, and counter electrode. The TiO2film is ideal electrode materials because of its high stability, photoelectric conversion efficiency, and low cost. The photoanode of TiO2is an important part of absorbing solar light and transmitting electronic in the dye-sensitized solar cells.Light harvesting, electron injection and collection, and unwanted electron recombination are all connect with the photoelectrode. So, modifying the TiO2is necessary to obtain the higher photoelectric conversion efficiency. In this report, we report on Double-layer TiO2films with different microstructure and crystal structure which can increase the photoelectric conversion efficiency of the dye-sensitized solar cells.Research contents and result as follows:(1) We report on the Double-layer TiO2films which consist of hollow TiO2boxes as overlayer and P25as underlayer.The TiOF2were synthesized by hydrothermal method. After calcinations of the TiOF2solid precursor, we got the hollow TiO2boxes. Microstructural characterizations by XRD、SEM、TEM and UV show the performance of HB-TiO2/P25TiO2film. The experiment results demonstrate that the Double-layer film cell achieved the highest conversion efficiency and reach up to a maximum value of6.4%. The enhanced efficiency of Double-layer film can be attributed to its light-scattering capability.(2) A TiO2double-layer composite film consists of flower-like TiO2as overlayer and P25as underlayer, which is designed as the photoelectrode of dye-sensitized solar cells. Microstructural characterizations by XRD、SEM、TEM、BET and UV show the performance of Flo-TiO2/P25film. The experiment results demonstrate that the Double-layer film consisting of different phase achieved highest conversion efficiency and reach up to a maximum value of9.9%.