A graph-based formulation for computational characterization of bulk heterojunction morphology

► Morphology descriptors are an elegant way to characterize and quantify the morphology. ► We formulate a broad suite of morphology descriptors. ► Descriptors characterize the multistage photovoltaic phenomena. ► Such extensive characterization enables easier and quantitative comparison between morphologies. ► The technique has the potential to become a standard characterization tool.