Add to ORKGWe report on the present on the present status of the plastic solar cell and on the design of fullerene derivatives and pi-conjugated donor molecules that can function as acceptor-donor pairs and (supra-) molecular building blocks in organized, nanostructured interpenetrating networks, forming a bulk-heterojunction with increased charge carrier mobilities. Finally, we report on the first and basic steps towards the preparation of such molecular building blocks.</p