中文摘要：

利用紫外-可见吸收光谱 对提取的叶绿素和4种天然染料（茶多酚、靛蓝、 红花黄、栀子黄）以及叶绿素与4种染料的共敏化 进行比较。通过电化学方法,研 究单一染料和共敏化染料的氧化还原电位。结果表明,杨树叶子中叶绿素最佳的提取 工艺条件为：提取料液比1∶50,提取温度60 ℃,提取时间3.5h。叶绿素与4种天然染料共敏化后不仅拓宽光谱吸 收波长范围,而且染 料激发态氧化电位与TiO2导带能级相匹配。其中叶绿素与栀子黄染料共敏化后,光电化学 性能最好。在太阳光模拟下,叶绿素与栀子黄对电池进行共敏化后光电转换 效率提高到0.67%,是叶绿素染料单独敏化的2.91倍。

英文摘要：

The ultraviolet-visible （UV-Vis） absorption spectra of chlorophyll,tea polyphenols,indigo,saffron,crocin and their co-sensitized dyes are compared.The state levels of dyes are measured by the electrochemical method. The results show that the optimum extraction conditions of chlorophyll the so lid-liquid ratio of 1∶50,extraction temperature of 60℃ and extraction time of 3.5h.The co-sensitized dyes can broaden the range of spe ctral absorption.Furthermore,the excited state level of co-sensitized dyes matches the couduction band edge of TiO2.The photoele ctrochemical property of the co-sensitization of chlorophyll and crocin is the best.The dye-sensitized solar cells （DSSCs） were fab ricated by using natural dyes as sensitizers.Using the co-sensitization of chlorophyll and crocin dyes as sensitizer can improve t he photoelectric conversion efficiency to 0.67%,which is 2.91times larger than that of the chlorophyll.