Structure Regulation Of Ordered Porous Materials And Applications In Dye Sensitized Solar Cells

Inverse opal TiO₂ photoanode has attracted particularly attentions in the field of dye sensitized solar cells（DSSCs）,because of its high electron transfer rate and light utilization efficiency.In recent years,methods like doping and complex have been employed to enhance the photoelectric properties of inverse opal TiO₂ photoanode.To increase the specific surface area and improve the photoelectric properties of inverse opal TiO₂ photoanode,its microstructure will be regulated in this thesis.In this thesis,the room temperature floating self-assembly method has been used to prepare PS opal photonic crystal templates with large area and high quality,which was then filled by liquid phase deposition（LPD）and removed by calcination,finally large-area and high-quality inverse opal TiO₂ photonic crystal was successfully obtained.PS three-dimensional（3D）photonic crystal prepared by conventional methods generally contains mono-sized particles and the layer number of particles is uncontrollable,which results in the photonic band gap can’t be adjusted.By combining air/water interface self-assembly method with layer-by-layer transfer,3D photonic crystals with adjustable photonic band gap position and depth were prepared.LPD was adopted to deposit TiO₂ nanoparticle on the framework of prepared inverse opal TiO₂ photoanode.The specific surface area was significantly enlarged and the dye adsorption ability was significantly enhanced,while the short-circuit photocurrent and the photoelectric efficiency was increased by 134.0% and 105.2% respectively when the inverse opal TiO₂ photoanode was assembled into DSSCs.3D ordered macro/mesoporous inverse opal TiO₂ photoanode were fabricated via a sol-gel method with polyethylene glycol 2000（PEG2000） acting as the mesopore directing agent.Compared to the one without mesopores,this kind 3D macro/mesoporous polyethylene results in significantly enlarged surface area and better dye adsorption ability.Meanwhile,the short-circuit photocurrent and the photoelectric efficiency was increased by 84.5% and 60.7% respectively when the inverse opal TiO₂ photoanode was assembled into DSSCs.