作者:Yuan Jay Chang、Po-Ting Chou、Yan-Zuo Lin、Motonori Watanabe、Chih-Jen Yang、Tsung-Mei Chin、Tahsin J. Chow
DOI:10.1039/c2jm35556f
日期:——
A series of organic dyes containing oligo-phenothiazine were synthesized and used effectively on the fabrication of dye-sensitized solar cells (DSSCs). In these compounds the phenothiazine moiety functions both as an electron donor and as a π-bridge. These materials exhibit considerably high values of open-circuit voltage (Voc) ranging from 0.78–0.83 V under an AM1.5 solar condition (100 mW cm−2). Two kinds of substituents, i.e., hexyl and hexyloxyphenyl groups, were added onto the N(10) of phenothiazine for comparison. The best device displayed a short-circuit current (Jsc) of 14.3 mA cm−2, an open-circuit voltage (Voc) of 0.83 V, a fill factor (FF) of 0.65, corresponding to an overall conversion efficiency of 7.78%. Their photophysical properties were analyzed with the aid of a time-dependent density functional theory (TDDFT) model with the B3LYP functional. The electronic nature of the devices was further elucidated by using electrochemical impedance spectroscopy.
合成了一系列含有寡聚苯噻嗪的有机染料,并有效地用于染料敏化太阳能电池(DSSCs)的制造。在这些化合物中,苯噻嗪基团既作为电子给体,又作为π-桥。这些材料在AM1.5太阳条件(100 mW cm−2)下表现出相当高的开路电压(Voc),值范围为0.78–0.83 V。为了比较,两个种类的取代基,即己基和己氧基苯基,被添加到苯噻嗪的N(10)上。最佳器件显示短路电流(Jsc)为14.3 mA cm−2,开路电压(Voc)为0.83 V,填充因子(FF)为0.65,对应的整体转换效率为7.78%。使用带有B3LYP功能的时间依赖密度泛函理论(TDDFT)模型分析了它们的光物理特性。通过使用电化学阻抗谱进一步阐明了器件的电子性质。