The need for superior materials for solar devices has enjoyed a new sense of enthusiasm. Indeed, the organic materials to be used in solar cells have been developed substantially in the last 30 years. The synthesis and device fabrication of organic solar cell materials can be grouped into two categories. The first category concerns the synthesis of small molecular systems with high purity. The second group of organic solar materials focuses on the creation of conjugated polymers and other macromolecular architectures with wide bandgaps. Organic conjugated polymers have played a major role in the electronic applications of semiconductors. The difficult part in developing conjugated bulk heterojunction (BHJ) solar cells is to create a particular strategic design for success in terms of the materials and bandgap. While much focus is put on the bandgaps of the conjugated polymers, there is also the possibility of tuning the fullerene bandgap in connection with the energy levels of the polymer.