Synthesis Of One-dimensional Nanomaterials And Its Applications In Quantum Dot Sensitized Solar Cells

Quantum dots show unique quantum effect, thus have strong photoelectric conversion capability in theory. The maximum theoretical efficiency of quantum dot solar cell may exceed60%, which is much higher than the limit of the conventional silicon cells (32%). So quantum dot sensitized solar cell has broad prospects in the future.Quantum dot sensitized solar cells (QDSCs) is similar with dye sensitized solar cell whose structure likes sandwich of photovoltaic devices composed with nanocrystalline semiconductor optical anode, redox electrolyte and counter electrode.Nanosemiconductor thin film is a very important part of QDSCs. The researchers focused on TiO2nano film.in the past years. In recent years, the researchers are paying more and more attention on nano ZnO with good controllable and high effective electronic transmission characteristics. This paper mainly studys the nanocrystalline electrodes and synthesise some nanosemiconductor material and its application.1. Different SiO2-TiO2composite nanomaterials were synthesized by sol-gel method. The composite materials were characterized by XRD, UV-Vis, FT-IR.2. Uniform surface and density of the ZnO thin films were prepared by magnetron sputtering technology. The samples were characterized by SEM and XRD. The influences of sputtering power, annealing treatment, and the size of seeds in the morphologies of the final-prepared ZnO film have been studied.3. ZnO nanorods were synthesized on the pre-films by hydrothermal method. The influences of the seed layer prepared by sol-gel method, magnetron sputtering method on the surface morphology, diameter, length and aspect ratio of ZnO nanorods have been studied. And magnetron sputtering target material in the preparation of ZnO seed also has been studied preliminarily.4. The photovoltaic devices were made up with ZnO nanorods, CdSe quantum dots, sulfur electrolyte and Pt counter electrode. ZnO seeds deposited at sputtering power of150W would have a bigger average size after annealing treatment. The as-prepared nanprods have the length of2.49μm, average diameter of170nm, the density of about10μm2, length-width ratio of9.5. CdSe sensitized cells (CdSe-QD) based on this photoanode material show short circuit current density of density of3.90A/cm’, open circuit voltage of0.30V and the photoelectric conversion efficiency up to0.42%.