Development of carbon neutral and sustainable energy sources should be considered as a top priority solution for the growing worldwide demand. Photovoltaics are strong candidate, more specifically, organic photovoltaics (OPV), enabling design flexible, lightweight, semitransparent, low-cost solar cells. However, active layer OPV is, now, mainly deposited from chlorinated solvents, harmful envir...

Nanoparticles (NPs) of donor–acceptor organic semiconductors are produced by a one-step nanoprecipitation with Janus morphology. Electron donor P3HT was blended electron acceptor PC61BM in tetrahydrofuran and then precipitated water, first surfactant second without surfactant. Cryogenic transmission microscopy reveals an internal structure at high magnification, for NPs which have, the past, be...