Balancing driving force, charge transport, and non-radiative recombination in organic solar cells with non-fused ring acceptors.

ABSTRACT: The design of low-cost, stable, and high-efficiency non-fullerene acceptors requires a deeper understanding of the impact of the molecular structure on photovoltaic performance. In this study, we investigate the influence of gradual side-chain modifications of non-fused ring acceptors. The transition from non- (L0) to partially (L2) and fully chlorinated (L4) side chains enhances the molecular self-assembly, condenses the intermolecular packing, and balances the electron and hole mobility. Additionally, we observe lower bimolecular recombination coefficients and field-independent exciton dissociation upon gradual chlorination of the side chains, which improves the fill factor of the devices. However, the accompanying higher non-radiative voltage loss restricts the performance of the fully

SUBMITTER: Zhang QQ 

PROVIDER: S-EPMC12648669 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature