Vacuuma??Free, Alla??Solution, and Alla??Air Processed Organic Photovoltaics with over 11% Efficiency and Promoted Stability Using Layera??bya??Layer Codoped Polymeric Electrodes

摘要： Nonfullerene organic photovoltaics (OPVs) have achieved breakthrough with pushing the efficiency exceeding 15%. While this shed light on OPV commercialization, high cost associated to the scalable device fabrications remains a giant challenge. Herein, we report a vacuum-free, all-solution and all-air processed OPV that yields 11.12% efficiency with fill factor of 0.725, thanks to the usages of high-merit polymeric electrodes and modified active blends. The design principle toward the high-merit electrodes is to induce a heavy acid doping into the matrices for a raised carrier concentration and mobility, make a large removal of insulating components in the whole matrices rather than surfaces, and restrain the formation of large-domain aggregates. A unique layer-by-layer doping was developed to enable the polymeric electrodes with record-high trade-offs between optical transmittance and electrical conductivity. Moreover, solvent vapor annealing was proposed to boost device efficiency and it has the advantages of finely adjusting the active blend morphology and raising the electron mobility. The resulting devices were highly efficient and they maintained most (~91%) of the initial efficiency in 30 day storage. This work gives the bright future for making cost-effective all-solution processed OPVs in air.