Burschka, JulianDualeh, AmalieKessler, FlorianBaranoff, EtienneCevey-Ha, Ngoc-LeYi, ChenyiNazeeruddin, Mohammad K.Graetzel, Michael2011-12-292011-12-292011-12-29201110.1021/ja207367thttps://infoscience.epfl.ch/handle/20.500.14299/76199WOS:000297381200011Chemical doping is an important strategy to alter the charge-transport properties of both molecular and polymeric organic semiconductors that find widespread application in organic electronic devices. We report on the use of a new class of Co(III) complexes as p-type dopants for triarylamine-based hole conductors such as spiro-MeOTAD and their application in solid-state dye-sensitized solar cells (ssDSCs). We show that the proposed compounds fulfill the requirements for this application and that the discussed strategy is promising for tuning the conductivity of spiro-MeOTAD in ssDSCs, without having to rely on the commonly employed photo-doping. By using a recently developed high molar extinction coefficient organic D-pi-A sensitizer and p-doped spiro-MeOTAD as hole conductor, we achieved a record power conversion efficiency of 7.2%, measured under standard solar conditions (AM1.5G, 100 mW cm(-2)). We expect these promising new dopants to find widespread applications in organic electronics in general and photovoltaics in particular.Conversion EfficienciesTransport LayersBehaviorDevicesDonortext::journal::journal article::research article