Excimer evolution hampers symmetry-broken charge-separated states.

ABSTRACT: Achieving long-lived symmetry-broken charge-separated states in chromophoric assemblies is quintessential for enhanced performance of artificial photosynthetic mimics. However, the occurrence of energy trap states hinders exciton and charge transport across photovoltaic devices, diminishing power conversion efficiency. Herein, we demonstrate unprecedented excimer formation in the relaxed excited-state geometry of bichromophoric systems impeding the lifetime of symmetry-broken charge-separated states. Core-annulated perylenediimide dimers (SC-SPDI₂ and SC-NPDI₂) prefer a near-orthogonal arrangement in the ground state and a π-stacked foldamer structure in the excited state. The prospect of an excimer-like state in the foldameric arrangement of SC-SPDI₂ and S

SUBMITTER: Sebastian E 

PROVIDER: S-EPMC9491171 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature