Interlayer enhancement of organic solar cells efficiency

aliphatic amine-functionalized perylene-diimide (PDINN) has strong unique hydrogen-bonding and electron selfdoping effect so that it accelerates the leapfrog speed of organic solar cells (OSCs) efficiency to the highest present level. Here the dye, PDINN is modified by dicarboxylate and tetra-phenyl-phosphonium moieties obtaining two cathode interfacial materials PDOEN and PDOP. PDOEN is still retaining half aliphatic aminefunction-group like PDINN; PDOP furnished with tetra-phenyl-phosphonium bromide. The two interfacial materials tuned the surface wettability, energy level alignment and physical contact properties, leading to device performance improvement. The power conversion efficiency was promoted from 15.43 % of PDINN based OSCs to 15.88 % of PDOEN based OSCs with PM6/Y6 as photo active system. For another photo active system PM6/L8BO, this parameter also enhanced from 17.13 % (PDINN device) up to 17.45 % (PDOEN device). Except for the open circuit voltage, the photo current increasement is noteworthy and can be observed visually by photocurrent map technology. The property of the two PDI-derivatives indicates that ester imide structures could be useful protocol in developing high-performance organic interlayer materials.