A–DA′D–A Nonfullerene Acceptor Obtained by Fine-Tuning Side Chains on Pyrroles Enables PBDB-T-Based Organic Solar Cells with over 14% Efficiency

The recent emergence of small acceptor molecules that are nonfullerene (NFSMAs) of A–DA′D–A type, particularly Y6, has accounted for the effective organic solar cells (OSCs). A new acceptor derivat...