The RADESOL project has as a main objective to achieve a more profound understanding at the molecular scale of the nanomorphology-performance relationship in active layer blends for bulk heterojunction (BHJ) organic solar cells, and thus focuses specifically on the relationship between the molecular structures and supramolecular organization within the active layer and the device physics responsible for the solar cell performance. As such, the research activities involved concentrate on the synthesis of active organic materials, the study of the physicochemical properties of the active layer (components and blend), the morphological structure of the blend, and the electro-optical characterization of devices prepared from these blends. As a direct impact of the project, a rational design of materials and active layers for OPV can be expected, providing a starting point for efficiency improvement of organic solar cells. The four partners (UHasselt, VUB, NTNU, and IT) from three European countries (Belgium, Norway, and Portugal) all have well-documented research activities in the field of organic electronics and in particular OPV. Their numerous contributions relate to all the different aspects needed to make fundamental progress in the field. A highly complementary and interdisciplinary team is gathered and a high level of synergy in the research activities can be achieved. As a direct benefit of the project, the scientific know-how within the European organic electronics community will be substantially reinforced.