High open-circuit voltage roll-to-roll compatible processed organic photovoltaics†
Raising the open circuit voltage (Voc) of organic photovoltaic (OPV) devices is one of the key parameters to enhance performance and increase utility. We report an active layer composed of a quinoxaline-based donor polymer and an N-annulated perylene diimide (PDI) dimer which are stable and readily scaled materials and as blended solutions can be processed into films using non-halogenated solvents and slot-die coating methods. OPV devices with a high Voc exceeding 1.2 V were obtained under one sun illumination. Furthermore, the practical application of indoor light recycling is demonstrated, reporting a high device Voc of 1.1 V under LED illumination. Modification of the cathode interlayer or addition of a third component using perylene diimide (PDI) based materials is shown to further enhance device Voc under all operating conditions.