Asymmetric small-molecule acceptor enables suppressed electron-vibration coupling and minimized driving force for organic solar cells.

ABSTRACT: Minimizing the energy loss, particularly the non-radiative energy loss (ΔE_nr), without sacrificing the charge collection efficiency, is the key to further improve the photovoltaic performance of organic solar cells (OSCs). Herein, we proposed an asymmetric molecular design strategy, via developing alkyl/thienyl hybrid side chain based asymmetric small molecule acceptors (SMAs) BTP-C11-TBO and BTP-BO-TBO, to manipulate the intermolecular interactions to realize enhanced luminescence efficiency and reduced energy loss. Theoretical and experimental results indicate that compared to the three symmetric SMAs BTP-DC11, BTP-DTBO and BTP-DBO, the asymmetric SMAs BTP-C11-TBO and BTP-BO-TBO exhibit repressed electron-vibration coupling and reduced ΔE_nr. Moreover, the asymmetric

SUBMITTER: Guo J 

PROVIDER: S-EPMC11811148 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature