Keywords: Acceptor; Molecular Conformation; Oligomer; Selenophene; Solar Cells EN Acceptor Molecular Conformation Oligomer Selenophene Solar Cells 1 1 1 10/31/23 20231106 NES 231106 B Two dimeric acceptors b , DIBP3F-Se and DIBP3F-S were synthesized by linking two Y6-derivative segments using different central linking bridges: selenophene and thiophene. Paired with the state-of-the-art polymer donor PM6, optimized solar cells employing DIBP3F-Se showcase remarkable performance with a power conversion efficiency of 18.09 %, as demonstrated by Donghong Yu, Thomas D. Anthopoulos, Ergang Wang et al. in their Research Article (e202302888). Back Cover: On the Conformation of Dimeric Acceptors and Their Polymer Solar Cells with Efficiency over 18 % (Angew. [Extracted from the article]