Previous computational work has shown that the size of the HOMO-LUMO gap of singlet species directly correlates with the stability of the triplet species. That is, polymers with a small HOMO-LUMO gap also have a more stable triplet ground state. Additionally, the identity of the acceptor monomer was found to have a high correlation with the stability of the triplet groundstate, where polymers that share the same acceptor monomer will have similar electronic properties .