Material Science and Engineering, Arizona State University, Tempe, Arizona 85287, USA.
Inorg Chem. 2013 Jul 1;52(13):7338-43. doi: 10.1021/ic3023453. Epub 2013 Jun 17.
The performance of small molecular organic photovoltaic materials is typically limited by their low exciton diffusion lengths, poor solubility, and poor energy level alignment with fullerenes so that the design and synthesis of new materials remain a top priority. To overcome these limitations, we explored the use of an iridium complex as a donor material with the potential for compatibility with solution processing, long exciton diffusion length and easy molecular modification for tunable optical or electrical properties. A bilayer device with a cyclometalated iridium complex and C60 resulted in a power conversion efficiency as high as 2.8%. Furthermore, a VOC of 1 V was achieved in the bilayer device despite an estimated exciton energy of only 1.55 eV, and the device showed minimal temperature and light intensity dependence.
小分子有机光伏材料的性能通常受到激子扩散长度短、溶解性差以及与富勒烯能级不匹配等因素的限制，因此设计和合成新型材料仍然是重中之重。为了克服这些限制，我们探索了使用铱配合物作为供体材料的可能性，因为它具有与溶液处理兼容、长激子扩散长度以及易于分子修饰以实现可调谐的光学或电学性能的特点。具有金属环戊二烯基铱配合物和 C60 的双层器件的功率转换效率高达 2.8%。此外，尽管估计激子能量仅为 1.55eV，但双层器件实现了 1V 的 VOC，并且器件表现出最小的温度和光强依赖性。
