Enhancing singlet excitons delocalization via selective asymmetric fluorination of electron acceptors for efficient organic solar cells.

ABSTRACT: Exciton dissociation in organic solar cells (OSCs) is primarily achieved through interfacial charge-transfer (CT) states, leading to a trade-off between open-circuit voltage (V_OC) and short-circuit current (J_SC). Spatially dispersed delocalized singlet excitons (DSEs) in nonfullerene acceptors (NFAs) provide an alternative channel to promote charge generation without interfacial CT state. Here, we manipulate intermolecular interactions, carrier dynamics, and photovoltaic properties through selective asymmetric fluorination. Two asymmetric molecules, Z12 and Z13, were synthesized by substituting the terminal group with different fluorine atoms compared with the symmetrical molecule, Z11. Z12 showed enhanced molecular interactions, promoting to more compac

SUBMITTER: Xu R 

PROVIDER: S-EPMC12164951 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature