“…Photoinduced processes are exploited in light harvesting and switching, data storage, or sensor technologies. − In recent years, in particular, organic semiconducting materials have achieved much attention due to the rise in energy conversion efficiencies of organic solar cells. − Besides a strong application-oriented research and development of organic solar cells or light-emitting diodes, a detailed analysis and characterization of the elementary processes in optically induced reactions is needed to optimize the performance of the optoelectronic devices. ,− Molecular ordering, contamination or doping, and varying ambient conditions influence photosensitive reactions. Furthermore, illumination conditions such as photon energy and photon dose have an influence that in combination makes the studies on photoinduced processes in organic materials to an elaborate and challenging research field. − However, only controlled experimental conditions and well-defined samples enable the investigation of the fundamental photophysical and -chemical processes, such as, for instance, photoinduced charge transfer at interfaces.…”