A Nonfused Ring Electron Acceptor with Aggregation‐Induced Emission Assistance Achieving Over 20% Efficiency in Organic Solar Cells

is reduced from 0.543 to 0.530 eV, resulting in a significantly increased PCE from 19.16% to 20.10%, which represents one of the highest PCEs reported for OSCs. This research will significantly contribute to the advancement of high-performance guest materials for the rapid development of single-junction OSCs.