New Amphiphilic Polypyridyl Ruthenium（Ⅱ） Sensitizer and Its Application in Dye-Sensitized Solar Cells

Amphiphilic polypyridyl mthenium（Ⅱ） complex cis-di（isothiocyanato）（4,4＇-di-tert-butyl-2,2＇-bipyridyl）（4,4＇- dicarboxy-2,2＇-bipyridyl）ruthenium（Ⅱ）（K005） has been synthesized and characterized by cyclic voltammetry, ^1H NMR, UV-Vis, and FT-IR spectroscopies. The sensitizer sensitizes TiO2 over a notably broad spectral range due to its intense metal-to-ligand charge-transfer （MLCT） bands at 537 and 418 nm. The photophysical and photochemical studies of K005 were contrasted with those of cis-Ru（dcbpy）2（NCS）2, known as the N3 dye, and the amphiphilic ruthenium（Ⅱ） dye Z907. A reversible couple at E1/2=0.725 V vs. saturated calomel electrode （SCE） with a separation of 0.08 V between the anodic and cathodic peaks, was observed due to the Ru^Ⅱ/Ⅲ couple by cyclic voltammetry. Furthermore, this amphiphilic ruthenium complex was successfully used as sensitizers for dye-sensitized solar cells with the efficiency of 3.72% at the 100 mW·cm^-2 irradiance of air mass 1.5 simulated sunlight without optimization of TiO2 films and the electrolyte.

联吡啶钌(Ⅱ)配合物的合成、晶体结构及其在染料敏化太阳能电池中的应用

制备了一个多吡啶钌(Ⅱ)配合物[Ru(bipy)2(Pyap)](PF6)2(1)(bipy=2,2′-联吡啶,Pyap=4-(2-吡啶亚甲氨基)-苯酚),研究了它在染料敏化太阳能电池中的应用,对它进行了元素分析、IR、1HNMR、UV-Vis、PL、XRD、CV、IV等表征。将配合物1的水溶液自然蒸发,得到配合物[Ru(bipy)2(Pyap)](PF6)2·H2O(2)的晶体,我们测定了它的单晶结构,配合物2的晶体属单斜晶系,P21/c空间群。配合物1的乙腈溶液在410～490nm处有较宽的对应于MLCT跃迁的紫外吸收峰。在波长为400nm光的激发下,分别在436、463、490nm处各出现了1个荧光发射峰。其CV曲线表明1有2对可逆的氧化还原峰,在-0.158V处有1个不可逆的氧化峰。用配合物1作为光敏染料组装成电池,测得最大输出功率Pmax为0.025mW,短路电流Isc为0.142mA,开路电压Voc为402mV,填充因子ff为0.444,光电转化效率η为0.025%。