Photoinduced Charge Transfer in Small-Molecule Organic Solar Cells Dependent on External Electric Field

AbstractsIn this paper, MTDATA is selected as the electron donor and BPhen as the acceptor, the trianiline structure of the donor molecule provides a variety of charge transfer pathways for charge separation. Based on Marcus theory, the photoinduced charge transfer properties of non-fullerene acceptor organic solar cells (NFA-OSCs) in external electric field (Fext) were studied. By analyzing the changes of reorganization energy (λ), Gibbs free energy (∆G), electron transfer integral (Vda) and charge transfer rate under the influence of Fext, it was found that Fext modulated the charge transfer rate.