Preparation Of Photo-anodes For Dye-sensitized Solar Cell By Screen Printing And Exploration Of Packaging Technology Of Dye-sensitized Solar Cell

The semiconductor anodes of Dye-Sensitized Solar Cell(DSSC) is also called photo-anodes, which is mainly composed by nanoporous titania(TiO2) film with high specific surface area value, and the ruthenium(II) polypryridyl complexes, the solution contains iodine ion, the conductive glass containing platinum. Usually, they are worked as dye, inelectrolyte and the counter electrode. Compared to other solar cells the emergence of this battery has brought innovation for the development of solar cells, DSSC has many advantages, such as simple produce process, stable performance, high cost-effective and high photoelectric transformation efficiency. So in this paper, the main goal is to achieve its industrial production. We researched the problem of actual industrial technical for DSSC, and finally we proposed and validated the corresponding solutions. The concrete research content is as follows:1. The preparation of TiO2 nanoparticles for DSSCWe prepared TiO2 nanoparticles with different pH value, reaction temperature, reaction time and found out the relationship between preparation conditions and the character of TiO2 nanoparticles. Hydrothermal is stable to prepare TiO2 nanoparticles. Results showed that the nanoparticles TiO2 prepared in condition of pH = 1.02, 180 ℃, 10 h possessed suitable anatase and uniform grain size about 20 nm. Because the materials dosage in the process of preparation and the volume of unit were both high, so the single yield of nanoparticles TiO2 reached 2.5-2.6 g.2. Some technical problems of screen printing for preparation of photo-anodesThe TiO2 paste for the preparation of DSSC could be prepared compatibly by screen printing, and the best parameter of The Ti O2 paste was: TiO2=19%, EC=40% PEG=25%. The photo-anode prepared by this paste had significant porous and better battery performance. In the printing processes, we chose 30° as the angle of the blade, and 25 kg/cm2 as the blade pressure. we also explored the impact of surface treatment to substrate, we found out the optimal parameters: temperature was 70 ℃, the time was 40 min, the sample was rinsed by ethanol and is heated in a tube furnace with 10 ℃/min, when the temperature was 450 ℃, kept the sample slowly cooled to room temperature. The optimal parameters for surface of the photo-anode is: 70 ℃, the time is 40 min, heated in 2 ℃/min, when the temperature was 450 ℃, kept 40 min and then kept the sample slowly cooled to room temperature.3. The materials and technology of DSSC packagingFirstly, photo-anodes needed to be immersed in the dye solution, I found the best time was 12 hours for immersion program. We also prepared the ITO conductive glass that have the low square resistance. Platinum was prepared in the ITO conductive glass by thermal decomposition process, and the materials of decomposition was chloroplatinic acid, which was printed by screen printing machine. Investigated relationship between printing times and the performance of DSSC. Finally, we based on present packaging technology of other batteries, we packed the DSSC by EVA. Implementation of packaging DSSC was achievable by hand. The test result verified, that the electrical performance and tightness of DSSC was remained at the same time when packaged by EVA.