Influence Of Doped TiO₂ Photoande On The Performance Of Dye Sensitizea Solar Cells

TiO₂ photoanode has determined the photoelectric performance of dye sensitized solar cells based on TiO₂.TiO₂ has wide bandgap?3.2eV?and the high recombination rate of photo-induced electron-hole pairs,which hindered the development of dye sensitized solar cells.Doping can improve the internal structure of TiO₂ and introduce the impurity level and defect position,that will restrain the recombination of holes and electrons and effectively improve the photoelectric conversion efficiency.Prepared the TiO₂ paste doped with the metal element?Zn,Ca,Mg?with P25.prepared nitrogen-doped anatase TiO₂ paste with sol-gel method,diethanolamine as the nitrogen source,butyl titanate as a titanium source.Doped the metal element on the basis of this power.Then the TiO₂ paste doped with N and metal element has been successfully prepared.Deposited the TiO₂ paste on the FTO via screen printing technology.After sintered on 450? and sensitized for 20 h,the sensitized TiO₂ photoanode is get.The morphology,crystal structure,surface electron binding energy and dye adsorption properties of TiO₂ were characterized by Scanning electron microscopy?SEM?,X-ray diffraction spectrum?XRD?,X-ray photoelectron spectroscopy?XPS?,UV-visible spectroscopy?UV-Vis?,energy dispersive spectroscopy?EDS?.The current-voltage?I-V?curves of dye sensitized solar cell is tested by Electrochemistry workstation.The influence of doping on the on the properties of dye sensitized solar cells is studied.The results show that the best doped element is Zn with photoelectric conversion efficiency of 5.59%.The photoelectric conversion efficiency of dye sensitized solar cell with N-doped TiO₂ is 5.86%.Compared to the conversion efficiency of pure TiO₂,the efficiency of solar cell doped with Nand Zn increased by 57%,reaching 6.55%.