Study On Synthesis And Properties Of Organic Dyes Based On Diarylvinyltriphenylamine Electron Donor

Since the beginning of the 21st century,the world has witnessed rapid development of science and technology,and new technologies have sprung up like bamboo shoots after a rain.Correspondingly,the demand for energy is also increasing rapidly.At present,about80%of energy comes from the consumption of fossil energy,and people’s large-scale use of crude oil and coal has brought huge environmental problems.Therefore,people have conducted a lot of research on green and renewable energy,including sunlight,in order to obtain economic and promising technologies to meet the ever-increasing energy demand.Among them,dye-sensitized solar cells(DSSC)have attracted widespread attention as a potential substitute for conventional organic silicon-based inorganic solid-state solar cells.The reasons are various,such as long life span:the service life can reach 15-20 years,the structure is simple,the production is easy,the cost of preparing the battery is low,and the energy consumption is low.The structure of organic small molecule sensitizers has a great influence on the photoelectric conversion efficiency of dye-sensitized solar cells.Through previous research in the laboratory,we found that the structure of diarylvinyltriphenylamine is a good electron donor.The dye cells with this structure have obtained high photoelectric conversion efficiency,the highest one can reach 7.62%.Therefore,we want to change the structure of the thiophene ring in the original compound and increase its light-trapping ability by adding aromatic rings to improve its photoelectric conversion efficiency.Based on the preliminary research results in the laboratory,the author of this article designed and prepared six organic dyes based on diarylvinyltriphenylamine electron donors,which are FWD6-1,FWD6-2,FWD6-3,FWD6-4,FWD6-5 and FWD6-6.They are under acidic conditions,the corresponding aldehyde compound reacts with cyanoacetic acid and ammonium acetate to obtain the final product.After the dye was synthesized,we used its proton nuclear magnetic resonance spectrum,carbon nuclear magnetic resonance spectrum and mass spectrometry to determine its chemical structure,and then used density functional theory to optimize its structure,and tested the photophysical properties and properties of these compounds.Electrochemical properties.Finally,it was used in dye-sensitized solar cells,and the photoelectric performance of the cells using these substances as sensitizers was tested.After testing the photoelectric conversion efficiency of these compounds,FWD6-1showed the best photoelectric conversion efficiency of 7.19%,its open circuit voltage was 0.715 V,the short circuit current was 14.73 m A/cm~2,and the fill factor was 68.31%.The photoelectric conversion efficiency of FWD6-2,FWD6-3,and FWD6-4 decrease in turn.And it is found that the introduction of acceptors between the donor and theπbridge will increase the spectral response range of the dye(FWD6-5 and FWD6-6),thereby obtaining the ideal photoelectric conversion efficiency.