Bulk heterojunctions

Patent Granted In bulk heterojunction cells, the electron donor and acceptor are mixed, forming a polymer blend (Fig 4). If the length scale of the blend is similar to the exciton diffusion length, most of the excitons generated in either material may reach the interface, where excitons split efficiently. Electrons move to the acceptor domains then were carried through the device and collected by one electrode, and holes move in the opposite direction and collected at the other side.