Fabrication of bulk heterojunction organic devices are disclosed that utilize in-situ polymerization of an active component of the device or an in-situ polymerization of an additive that controls the device morphology. According to an aspect, a method for the synthesis of a BHJ photovoltaic film may comprise preparing a homogeneous solution comprising 2,5-dibromothiophene and/or 2,5-diiodothiophene, P3HT and PCBM. The method may also comprise preparing a thin film of the homogeneous solution on the solid surface of a material or an assembly capable of acting as an anode. Oxygen may be excluded from the environment where the thin film will be exposed to photopolymerization by placing the thin film and anode assembly in an inert-gas environment. The method also comprises exposing the liquid film to UV light for a sufficient duration of time and at a sufficient temperature to cause photopolymerization to occur.
FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 The technology disclosed herein was made with government support under grant number DE-FG02-98ER45737 awarded by the Department of Energy, Office of Science, Office of Basic Energy Science, and Division of Materials Science and Engineering. The United States government may have certain rights in the technology.