Control of composition within domains and at the interfaces between domains, within organic photovoltaic blend devices, is a key aspect of performance. Using neutron reflectivity experiments on model polymer/small molecule bilayers, the authors measure layer composition and interfacial width following thermal annealing, and examine the applicability of equilibrium thermodynamic theory for quantification of behaviour as a function of polymer molecular weight.
- E. L. Hynes
- J. T. Cabral
- A. M. Higgins
