Three organic dyes 2,6-bis(iminoalkyl)pyridines [2,6-(2,6-R2C6H2NCMe)2]C5H3N (R = methyl, ethyl, isopropyl) (named DM, DE and DP, respectively) were synthesized and assembled onto nanocrystalline TiO2 film to prepare 2,6-bis(iminoalkyl)pyridine/N719 co-sensitized photoelectrodes for dye-sensitized solar cell (DSSCs) applications, and their photoelectrochemical performances were studied. In each of the three composite electrodes, the aggregation of N719 was alleviated and its spectra response was enhanced by the 2,6-bis(iminoalkyl)pyridines in region of 400 to 750 nm, and the total resistance of DSSCs was decreased after co-sensitizing with 2,6-bis(iminoalkyl)pyridine, all of which facilitate to improve efficiency of DSSCs. The optimized cell which was co-sensitized with DM gave a short circuit current density of 16.57 mA cm−2, an open circuit voltage of 0.72 V and a fill factor of 0.59 corresponding to an overall conversion efficiency of 7.00% under standard global AM1.5 solar irradiation conditions, which is 28.91% higher than that for DSSCs only sensitized by N719 (5.43%). The incident photo-to-current conversion efficiency, electrochemical impedance spectroscopy, surface photovoltage spectroscopy and UV-visible adsorption spectra were used to analyze their photoelectrochemical performances, and X-ray single-crystal structural analysis was used to analyze the structures of 2,6-bis(iminoalkyl)pyridines.
合成了三种有机
染料2,6-双(
亚胺烷基)
吡啶[2,6-(2,6-R2C6H2NCMe)2]C5H3N(R=甲基、乙基、异丙基)(分别命名为
DM、DE和DP),并将其组装到纳米晶TiO2膜上,制备了2,6-双(
亚胺烷基)
吡啶/N719共敏化的
染料敏化太阳能电池(DSSCs)光电极,并研究了它们的光电
化学性能。在三种复合电极中,2,6-双(
亚胺烷基)
吡啶在400~750 nm区域增强了N719的光谱响应,减轻了N719的聚集,并且在共敏化后DSSCs的总电阻降低,这些都有助于提高DSSCs的效率。优化后的电池在
DM共敏化下,在标准全球
AM1.5太阳光辐射条件下,短路电流密度为16.57 mA cm−2,开路电压为0.72 V,填充因子为0.59,总体转换效率为7.00%,比仅由N719敏化的DSSCs(5.43%)提高了28.91%。利用入射光子-电流转换效率、电
化学阻抗谱、表面光电压光谱和紫外-可见吸收光谱分析了它们的光电
化学性能,并利用X射线单晶结构分析了2,6-双(
亚胺烷基)
吡啶的结构。