Preparation Of Carbazole-based Dye-sensitized Solar Cells

The solar energy is inexhaustible characteristics, is a clean non-polluting energy, therefore, from the rational use of energy and environmental protection point of view, solar cell materials research more and more attention, solar energy into electricity has always been the goal of human dreams, Dye-sensitized solar cell is to achieve such a class of photovoltaic devices.Carbazole in this paper as raw material, and dibromoethane reaction ethylcarbazole; again POCl3 in anhydrous DMF and the conditions, so that formylation ethylcarbazole. Then, after bromination, and then purified. The product with thiophene boronic acid coupling, and then brominated, get new productIn addition, the Michaelis-one for raw materials, through the reduction reaction, and then under the condition of the ice bath gaya, triethyl phosphite and iodine, the reaction of phosphate in the solvent THF and then with the next and Bromobenzaldehyde of potassium tert-butyl reaction with Bu-Li and B (OCH3) 3 response eventually be material. And another step in the purification of the product in the coupling reaction under palladium catalyst, followed by the addition of acetonitrile and chloroform, and piperidine acid, heating the final product back to be.In this dissertation, we have designed and synthesized four new carbazole derivatives containing N,N-dimethylaryl amine moieties as secondary electron-donating groups. Both carbazole and N,N-dimethylaryl amine constructed an electron donor cascade. The structures of the dyes have been characterized by IR nuclear,magnetic resonance and mass spectra (MS) techology. The photophysical, electrochemical properties and the performance on Dye-sensitized nanocrystalline solar cells (DSSC) of the dyes are measured and studied.The dyes gave high molar extinction coefficient and high maximum IPCE value (88%). These results imply that sensitizer, which use cyanoacetic acid as electron-withdrawing part, introducing a secondary electron-donating group and is a possible alternative to give high electron injection efficiency and charge separation efficiency. The power conversion efficiency of the DSSCs based on the xs13 reached 4.0%. ascribed to the lack of broad absorption in the visible spectrum. Additionally, the organic sensitizer introducingπ-electron systems between donor and acceptor moieties had better performance than the dyes development introducingπ-electron systems between two donors.