新型半菁染料阳离子和含锌硫代富瓦烯配阴离子的电荷转移复合物光电响应性质的研究

对一种新型半菁发色基团的碘化物--(反式)-N-十八烷基-4-(2-(4-(2-二甲基氨基)苯基)乙烯基)喹啉碘化物和含锌硫代富瓦烯配阴离子形成的电荷转移复合物:二-(反式)-N-十八烷基-4-(2-(4-(2-二甲基氨基)苯基)乙烯基)喹啉]合硫代富瓦烯锌酸盐的成膜性以及它们的LB膜修饰ITO电极上的光电响应性质进行比较研究,用含锌硫代富瓦烯配阴离子对这种半菁发色团阳离子进行组装后,能够改善其成膜性,使单位面积上的半菁发色团数目增加.同时,含锌硫代富瓦烯配阴离子的强吸电子能力还影响半菁发色团的电荷分布,使之有利于电荷分离,从而提高了光电流的量子产率.在无外界影响时,其光电转化的量子产率达0.9%,是碘化物的1.8倍.

Investigation of Photoelectric Conversion from an Novel Charge Transfer Compound of a Hemicyanine Dye Containing Zinc Complex Anion

A new type of charge transfer complex of a hemicyanine dye containing zinc complex anion: (CH 3) 2NC 6H 4 CHCH C 10 H 6NC 18 H 37 2Zn(dmit) 2(where dmit=4,5 dimercato 1,3 dithiole 2 thione)(A 2S) has been studied on its LB film property and photoelectric conversion from its LB film modified ITO electrode compared with a hemicyanine dye iodide: (CH 3) 2NC 6H 4 CHCH C !0 H 6NC 18 H 37 I(AI). The results show that the quantum yield of A 2S is 1.8 fold increased in comparison with that for AI. This can be explained by the fact that when the conductive zinc complex anion is used to replace I - to form hemicyanine complex, the LB film property can be improved and also the charge separation of the hemicyanine dye become more effective. This kind of compound can be evaluated as a promising photoelectric conversion material.