2,1,3-Benzothiadiazole-5,6-Dicarboxylic Imide - A Versatile Building Block for Additive- and Anneal ing-Free Processing of Organic Solar Cells with Efficiencies Exceeding 8%

摘要

The development of organic semiconductors for organic photovoltaic (OPV) applications has advanced rapidly in recent years. While the electron acceptor of choice is still predominantly a fullerene derivative such as [6,6]-phenyl-C71-butyric acid methyl ester (PC_(71)BM), an immense array of different light-absorbing electron-donor materials has been reported and encouragingly device efficiencies for single junction cells are approaching 10%. In this context, it is worth noting that all the highest performing OPV devices have been achieved with the use of solvent processing additives, additional organic extraction layers, or similar device engineering efforts. Although important for driving the field of organic photovoltaics forward, significant manufacturing challenges are associated with the increased complexity of the photovoltaic device. Therefore, it is still crucial to pursue and further improve the synthetic design and development of organic light absorbing materials, which have yet to surpass the 8% efficiency mark in a standard solar cell configuration without solvent additives or additional organic extraction layers.