The role of interfaces in photovoltaic devices

Organic opto-electronic devices comprise one or more organic layers and the electrodes. The interfaces between these very different components play a crucial role to the performance of the devices. In donor-acceptor composite s for photovoltaics, the electronic processes occurring at the interface wi ll benefit from a particular interface morphology on the 10-100 nanometer l evel; this is demonstrated for composites of oligophenylenevinylene and C-6 0 Phase separation on such a scale may be achieved naturally in diblock cop olymers. The synthesis of an OPV-C-60 diblock copolymer is described.