Singlet fission (SF), a process that converts one singlet exciton into two triplet excitons, has become increasingly popular because it has the potential to exceed the Shockley-Queisser limit in single-junction solar cells. SF can occur between two acene chromophores that are bonded together (intramolecular SF, iSF) or interacting through space (intermolecular SF, xSF). We sought a system that would incorporate the best characteristics from both fields: the rapid generation and slow recombination of xSF systems, but the high degree of synthetic control over pi-pi overlap afforded to iSF. To achieve this goal, we designed a polymer with pentacene sidechains. Pentacene polymers undergo efficient SF with a biexponential decay of singlet signal leading to slow triplet recombination. These polymers exhibit molecular weight dependent triplet recombination.

Singlet fission in pentacene polymers

256th National Meeting (2018)

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