A green route to a novel hyperbranched electrolyte interlayer for nonfullerene polymer solar cells with over 11% efficiency

A novel environmentally-friendly hyperbranched electrolyte PNSO3Na organic interfacial layer has been synthesized; this can tune the interfacial energy alignment and induce the upper active layer to form a bi-continuous nano-micro phase separation face-on orientation. Based on a PBDB-T:ITIC active layer, the device with a ZnO/PNSO3Na ETL exhibits a high efficiency of 11.2%.