A Multifunctional Tyrosine-Immobilized PAH Molecule as a Universal Cathode Interlayer Enables High-Efficiency Inverted Polymer Solar Cells (Advanced Optical Materials 21/2021)

Yong Chae Jung and co-workers report Tyr–perylene diimide–Tyr (PDI-Y) as a molecular-based artificial photosystem II, see article number 2101006. From spectroscopic and theoretical investgations, they reveal that the presence of covalently-immobilized Tyr can enhance the intramolecular charge separation, leading to a significant reduction of the exciton recombination probability. Additionally, it is found that the utilization of PDI-Y as a cathode interlayer can improve the photovoltaic performance of polymer solar cells owing to its light-harvesting ability and charge generation/transport capability.