Study On Nanoarray Photoanode Of Dye/Quantum-dot Sensitized Solar Cells

As a new-type of solar cells, dye or quantum-dot sensitized solar cells（DSCs or QDSCs）, have wide application prospects. The photoanode is an im-portant component of sensitized solar cells. Compared with the nanoparticlefilms, the one-dimensional nanomaterials can provide fast pathways for elec-trons and have the potential to enhance the charge collection efficiency of solarcells.In this thesis, fabrication and application of one-dimensional TiO₂nano-materials were studied. First, TiO₂nanowire arrays were prepared by a hydro-thermal method and then coated with a layer of MgO. The charge recombinationat the interfaces of electrode and electrolyte was inhibited by MgO insulatinglayers. The overall conversion efficiency of DSCs was improved. Electrochem-ical impedance spectroscopy （EIS） measurement was also applied to study theelectron transport and recombination properties of DSCs.TiO₂nanotube is another important one-dimensional nanomaterial.TiO₂nanotube arrays were fabricated by anodization. The dimensions and micro-structurs of nanotubes were controlled by tailoring electrolyte compositions,anodization potential and duration. The effect of dimensions of nanotubes on theperformance of DSCs was investigated.Quantum dots （QDs） have become one of the most popular subjects for re-search into the next generation of solar cells. There are few reports about quan-tum dots sensitized one-dimensional nanomaterials. Ag₂S QDs were assembledon TiO₂nanotube electrodes by chemical bath deposition （CBD）. The compo-nent, microstructure, energy level structure and photoelectric properties of theQDs were investigated.