Conjugated polymers can be processed from solution; this attractive feature opens up the realization of roll-to-roll based production processes. Yet commercial success has been hindered. The MPI-P recently demonstrated that the intrinsic properties of conjugated polymers have been masked by defects and therefore have not been fully exploited so far. Our aim is to uncover and characterize these intrinsic properties and improve them further. Using polymer blends, novel properties and nanostructures are realized by controlling the phase separation between various functional polymers.