Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P.R. China.
Chem Asian J. 2012 Jun;7(6):1426-34. doi: 10.1002/asia.201200027. Epub 2012 Apr 11.
Four new unsymmetric platinum(II) bis(aryleneethynylene) derivatives have been designed and synthesized, which showed good light-harvesting capabilities for application as photosensitizers in dye-sensitized solar cells (DSSCs). The absorption, electrochemical, time-dependent density functional theory (TD-DFT), impedance spectroscopic, and photovoltaic properties of these platinum(II)-based sensitizers have been fully characterized. The optical and TD-DFT studies show that the incorporation of a strongly electron-donating group significantly enhances the absorption abilities of the complexes. The maximum absorption wavelength of these four organometallic dyes can be tuned by various structural modifications of the triphenylamine and/or thiophene electron donor, improving the light absorption range up to 650 nm. The photovoltaic performance of these dyes as photosensitizers in mesoporous TiO(2) solar cells was investigated, and a power conversion efficiency as high as 1.57% was achieved, with an open-circuit voltage of 0.59 V, short-circuit current density of 3.63 mA cm(-2), and fill factor of 0.73 under simulated AM 1.5G solar illumination.
已经设计并合成了四个新的不对称铂（II）双（芳基乙炔基）衍生物，它们具有良好的光捕获能力，可作为染料敏化太阳能电池（DSSC）中的光敏剂。这些基于铂（II）的敏化剂的吸收、电化学、时间依赖密度泛函理论（TD-DFT）、阻抗谱和光伏性能已得到充分表征。光学和 TD-DFT 研究表明，引入强供电子基团可显著增强配合物的吸收能力。通过对三苯胺和/或噻吩给体进行各种结构修饰，可以调节这四个金属有机染料的最大吸收波长，将光吸收范围提高到 650nm 左右。研究了这些染料作为介孔 TiO2 太阳能电池中的光敏剂的光伏性能，在模拟 AM 1.5G 太阳光照下，实现了高达 1.57%的功率转换效率，开路电压为 0.59V，短路电流密度为 3.63mA/cm-2，填充因子为 0.73。
