ABSTRACT
This chapter presents the principle of the operation of a polymer/polymer solar cell and the design rules to achieve higher efficiency. The photochemistry of the polymer materials used as well as some examples of the blends will also be discussed. The fast improvement of the power conversion efficiency of the all-polymer cells shows that they are good candidates for overcoming the mentioned limitation of fullerene-based Organic solar cell. The combination of good chemical and electronics properties of the donor and the acceptor as well as the development of managing structure morphology would lead to an efficient solar cell product, more stable and with less production cost than a fullerene solar cell. Efficiency of the photovoltaic device is strongly dependent on the donor/acceptor proportion. Consequently, in the polymer/fullerene blend the absorbed energy needed to produce excited electron–hole pairs, is mainly induced by the polymer donor.
