Research Of Based On The Photoanode Of Titanium Oxide Nanotubes Array Dye-sensitised Solar Cells

TiO2has excellent photosensitive, gas sensitive and photoelectric properties, in the photocatalytic degradation of pollutants, various sensors and solar cells and other high-tech fields have extensive and important applications, has become a hot research of semiconductor materials at home and abroad. One-dimensional TiO2nanotubes have special structure of arrangement rule, larger specific surface area and strong adsorption ability, showed higher photocatalytic performance and photoelectric conversion efficiency. This paper adopts simple electrochemical anodic oxidation method prepare TiO2nanotube array films which has direct electronic transmission channel. Through using TiCl4treatment, TiO2sol and the sol particles further doping methods to photoanode of nanotube arrays for a series of surface treatment, significantly improved photoelectric conversion efficiency of the dye-sensitised solar cell.Arrangement rules, highly ordered TiO2nanotube arrays film prepared by two-step electrochemical anodic oxidation on the Ti foil, different thickness nanotube arrays film prepared by controlling the anodic oxidation time and temperature, and the mechanism for the formation of the nanotubes studied. Furthermore, we successfully implement the stripping of TiO2nanotube arrays film, transfer and cell assembly, photoelectric performance test was carried out on the cell under a simulated standard sunlight.In order to improve the photoelectric energy conversion efficiency of the cell, we optimize photoanode by following treatment:[1] Through the Ticl4treatment to introduction of the diameter of about10run TiO2particles into the nanotube arrays, due to introduction of particles increased the specific surface area of the nanotubes, significantly increased the adsorption of dye molecules for photoanode. Using0.04M TiCl4treatment, achieved3.13%of the photoelectric energy conversion efficiency, under the condition of invariable in concentration, photoanode treated for different time, energy conversion efficiency of cell increased from4.70%of pure tube to7.63%.[2] TiO2sol prepared by sol-gel method, soaked the nanotube arrays in sol, successfully introduced diameter about20nm TiO2particles into the nanotube arrays. Experiment found that T1O2sol treatment nanotube arrays of better time is0.5-2hours, achieved more than9.6%of the energy conversion efficiency, treatment2hours can get the highest conversion efficiency of9.86%. To enhance the efficiency of the cell on the one hand is because of photoanode surface area increased caused by particles is introduced, on the other hand is due to the introduction of20nm particles, the neck can realize effective connection, avoid carrier interface of composite in the process of transmission. More importantly because of ammonia and alcohol added during the preparation of sol leads to a large number of hydroxyl groups were introduced to the surface of titanium oxide, combined with the carboxyl group in the dye molecules, increased the nanotube arrays for dye adsorption capacity, which significantly improves the short-circuit current and energy conversion efficiency of the cell.[3] Further, we introduce W doping in the process of preparing titanium oxide sol, the doping particles into the titanium oxide nanotube arrays. Experiment found that the right amount of W doping can regulate the conduction band of photoanode location is moved, improve the efficiency of dye molecules of excited states into semiconductor conduction band, and inhibit the recombination of the oxidation state dyes and I3-in the electrolyte in the process of carrier transmission. When the doping content was0.8wt%, photoelectric power conversion efficiency of the cell was10.11%.