Laboratory for Photonics and Interfaces, Swiss Federal Institute of Technology, CH 1015, Lausanne, Switzerland.
Dalton Trans. 2009 Dec 7(45):10015-20. doi: 10.1039/b908673k. Epub 2009 Jul 28.
We report a new class of molecular insulators that electronically passivate the surface of nanocrystalline titania films for high performance dye sensitized solar cells (DSC). Using electrical impedance measurements we demonstrate that co-adsorption of dineohexyl bis-(3,3-dimethyl-butyl)-phosphinic acid (DINHOP), along with the amphiphilic ruthenium sensitizer Z907Na increased substantially the power output of the cells mainly due to a retardation of interfacial recombination of photo-generated charge carriers. The use of phosphinates as anchoring groups opens up new avenues for modification of the surface by molecular insulators, sensitizers and other electro-active molecules to realize the desired optoelectronic performance of devices based on oxide junctions.
我们报告了一类新型的分子绝缘体，它们可以使纳米晶二氧化钛薄膜的表面电子钝化，从而获得高性能染料敏化太阳能电池（DSC）。通过电阻抗测量，我们证明了偕二正辛基双（3，3-二甲基丁基）膦酸（DINHOP）与两亲性钌敏化剂 Z907Na 共吸附，大大提高了电池的功率输出，主要是由于光生电荷载流子的界面复合得到了抑制。膦酸盐作为锚定基团的使用为通过分子绝缘体、敏化剂和其他电活性分子来修饰表面开辟了新的途径，以实现基于氧化物结的器件的理想光电性能。
