太阳能电池用联吡啶铼光敏染料研究  

Study of rhenium bipyridyl photosensitive dyes used for solar cells

作　　者：孙世国[1] 彭孝军[1] 徐勇前[1] 时磊[1] 孙立成[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,辽宁大连116012

出　　处：《大连理工大学学报》2004年第4期498-501,共4页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(2000761747).

摘　　要：合成了3种含有羧基的联吡啶铼光敏染料[(2,2′-联吡啶-4,4′-二羧酸乙酯)Re(CO)3(R-吡啶)PF6](R=H,CH3,NH2),对染料的光、电化学性能进行了研究.在吡啶配体上引入供电基团—CH3或—NH2,染料的MLCT(金属-配体间电荷转移)最大吸收波长发生红移、氧化还原电位降低.激光闪光光解研究表明,3种染料激发态衰减速率分别为1.2×107、1.7×107和3.7×108s-1,远小于电子注入的速率(纳米TiO2的为1011～1013s-1),可望实现电子向TiO2导带的传递.引入供电基团后的吡啶配体可能向染料激发态传递电子,加快其衰变,从而减少注入到TiO2中的电子回传给染料激发态的可能,提高光电转换效率.Three kinds of rhenium bipyridyl photosensitive dyes [(4,4′-di-COOEt-bpy)Re(CO)_3( R - pyridine)PF_6], where bpy is 2,2′-bipyridine and R is hydrogen, methyl or amino, were synthesized. Their photophysical and electrochemical properties were also studied. By introducing electron-donating group such as -CH_3 or -NH_2 on the pyridine ligand, the absorbance maximum of MLCT (metal-to-ligand charge transfer) red-shifted and the redox potentials were reduced. The detected transient excitation decay rates of the three dyes by laser flash photolysis are 1.2×10~7, 1.7×10~7 and 3.7×10~8 s^(-1) respectively, much less than the electron injection rate (to nano-TiO_2: 10^(11)~10^(13) s^(-1)). The excited states of the dyes are quenched by the electron-donating group (such as NH_2) on the pyridine ligand. It might reduce the possibility of the back transfer of the injected electron to the dye and can get better photo-to-current conversion efficiency.

关 键 词：联吡啶铼光敏染料 太阳能电池 纳米二氧化钛 电化学 光谱性能 氧化还原电位 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ610.1[化学工程—精细化工]