Synthesis And Photovoltaic Characterization Of Novel Electrolytes In Dye-Sensitized Solar Cells

This work had developed novel quaternary ammonium salt for high efficiency and low cost DSSC application and investigation. The main conclusions are summarized as follows.The photochromism of spiropyran and spirooxazine dyes containing functional cationic groups and six novel quaternary ammonium salt were successfully synthesized. The chemical structures of above compounds were conformed by MS,1H-NMR,13C-NMR, g-COSY and g-HSQC.The photochromism of dyes containing functional cationic groups were studied by UV-Vis spectra. The results showed that spiropyran containing trimethyl amine cationic moiety exhibited negative photochromic properties. But the spiropyran containing octadecylpropan amine cationic moiety only displayed normal photochromic properties during the irradiation process of UV light. Spirooxazines had normal photochromic properties and good fatigue resistance.The above compounds were used as electrolytes for DSSC, and the efficiencies had been tested under simulated sunlight. Electrolytes containing compound 10 and 14 were injected into the sandwich cells. The power conversion efficiency had reached 6.63%and 6.74%, respectively (air mass 1.5 global,100 mW/cm2). New novel quaternary ammonium salt will broaden our eyeshot to find a series of new electrolyte materials in the application of DSSC.This paper presents the influence of N-methylimidazole on solar cell performance and compares the properties of the 4-tert-butylpyridine additive, which is the most popular additive for the electrolyte solution in the dye-sensitized solar cell. The additive for optimization will become much clearer and more important in the power conversion efficiency may be expected.