Importance of Terminal Group Pairing of Polymer Donor and Small‐Molecule Acceptor in Optimizing Blend Morphology and Voltage Loss of High‐Performance Solar Cells

As a variety of non‐fullerene small molecule acceptors (SMAs) have been developed to improve power conversion efficiency (PCE) of organic solar cells (OSCs), the pairing of the SMAs with optimal polymer donors ( P D s) is an important issue. Herein, a systematic investigation is conducted with the development of the SMA series, named C6OB‐H, C6OB‐Me, and C6OB‐F, which contain distinctive terminal substituents –H, –CH 3 , and –F, respectively....