Structural measurements of polymer-fullerene blend films for organic photovoltaics

Organic photovoltaic (OPV) technology has the potential to greatly lower the cost of solar cell fabrication by enabling ink-based deposition of active layers. In bulk heterojunction (BHJ) OPV devices, the power conversion efficiency critically depends on the distribution of the polymer absorber and the fullerene electron acceptor (e.g., the blend morphology). Our program develops measurement methods to probe the structure of OPV devices, with a focus on the morphology of the BHJ layer.