Synthesis And Design Of Organic Photosensitizer Based On Carbazole Moieties And Their Photovoltaic Performance

Chapter one: we briefly described the research background of DSSCs, and introduced their schematic structure, working principle, evaluation parameters, working electrode and the electrolytes. BESIdes, the latest development of new sensitizers were also reviewed. Bearing these in mind, the molecular d ESIgn and research contents of this th ESIs were outlined.Chapter two: This topic uses carbazole as the starting material by Suzuki, Vilsmeier Haack, Buchwald-Hartwig and Knoevenagel reaction to synth ESIs five kinds of organic photosensitive dye, four different types of carbazole unit were grouped into three aniline as the donner, ring glutaric thiophene as conjugate bridge, cyano acetate as electron acceptor of organic photosensitive dyes X72-75, at the same time, the classic three aniline organic photosensitizer C218 was synth ESIzed as reference, and we characterize the structures of the dyes and their intermediates.Chapter three: We tested photovoltaic performance of the synthetic dyes in various solvent systems and different cobalt electrolytes.The study found that(1) when using the ternary solvent Me CN, DCM and t-Bu OH(1.5, 1.5, 2 volume ratio), photovoltaic performance of battery is better than the binary solvent DCM and t-Bu OH(2.5 : 2.5 volume ratio), the main reason is that dye adsorption on the Ti O2 thin film of using ternary solvent is less.(2) the photovoltaic performance of battery based on the Co-Phen as electrolyte is poor than the Co-bpy, because the Redox potential of Co-Phen is 0.62 V(vs NHE), and Co-bpy is0.56 V(vs NHE), then the Co-Phen leads to a poor driving force of regeneration. In addition,we found that the battery photoelectric conversion efficiency of X72-74 is better than X75 and C218, demonstrating the superiority of the asymmetric d ESIgn of the triphenylamine electron donor over the symmetrical triphenylamine when applied in organic dyes for cobalt cells. Based on Co-bpy electrolytet, AM 1.5 standard illumination conditions, the short-circuit current of X72 is 14.6 m A cm-2, the total photoelectric conversion efficiency can reach9.18%.Chapter four: The summary of this article...