Fabrication Of The Large-Sized Dye-Sensitized Solar Cells By Electrostatic Spray Plating Technology

Dye-sensitized solar cells(DSSC) is a new type of photoelectrochemical solar cells, compared with traditional silicon-based semiconductor batteries, it has already attracted the interest of researchers. Because of the advantages of its low cost, stable performance, simple preparation process, and have no pollution to the environment. Nano-crystalline TiO2 thin film electrodes is the key factor of DSSC, its performance directly influences the conversion efficiency of DSSC. The transparent conductive substrate is a necessary material in making the dye-sensitized solar cells. It can be used as the reflector and the transparent electrode of a solar cell, increasing the light transmittance of visible light and improving the conversion efficiency of the battery, in order to optimize the large-sized performance of DSSC. It is important for DSSC to make the nana-crystalline TiO2 thin film electrode and the transparent conductive substrate with good performance.The paper combined with the electrostatic atomization technology and a precision control platform, assembling the platform of automatic electrostatic spray coating processing, making the electrostatic atomization technology moving and spraying at a constant speed,Implemented the large-sized uniform coating of TiO2 thin film. Through studying the influence of thickness and surface topography of large sized of nanocrystalline TiO2 thin film electrode,making a good performance of a single TiO2 thin films preparation and parallel TiO2 thin film, assembled into large-sized of a single DSSC and parallel structure DSSC.Research shows:it can be know from the analysis of the micro-structure of the TiO2 thin film, by means of scanning electron microscope (SEM),with the spraying speed of 4 mm/s to make TiO2 thin film, the thickness about 50 microns, the film are uniform and not easy to crack, the TiO2 Nanoparticles are connected to formed 2 d mesh,microporous structure, it's better for adsorption of dye, the photoelectric conversion efficiency of DSSC is the highest, the value is 4.21%.AZO films conducting substrate was prepared by automatic processing platform. Orthogonal design was employed for studying the effect of sol concentration, dosage concentration, spraying velocity and heat treating temperature on the AZO film. Through comparison of light transmittance and resistive range value, the degree order of the effects was determined. Taking overall consideration of light transmittance.Specific resistance by Intuitive analysis, the parameters of the optimized process are figured out for preparing the AZO film with excellent photoelectric property:light transmittance within the visible light range is 80%,resistance is 210K?:sol concentration, dosage concentration, spraying speed and heat treating temperature respectively are 0.35mol/L,1%,4mm/s and 500?.In conclusion, it's practical to prepare large-sized DSSC by precisely control plate and electrostatic atomization. This research can provide basis for transforming large-sized DSSC to industrialized production.