Introduction Click to copy section linkSection link copied! Singlet fission (SF) (1,2) holds great potential as a down-conversion strategy to reduce energy losses and boost the efficiency of solar cells beyond the 33% thermodynamic limit. (3−6) In its simplest description, this process involves the interaction of a chromophore in the singlet excited state 1(S1) with a neighboring ground-state chromophore 1(S0) to afford two independent triplet excitons 3(T1) via a correlated triplet pair 1(T1T1).