Triplet excited states are associated with both the shortcomings and possible developments in organic photovoltaics. On one hand, triplets are associated with detrimental charge recombination in existing cells; on the other hand, their typically long lifetimes and diffusion lengths could be beneficial for some designs. An unusual mechanism for generating triplet excited states, namely singlet fission, is predicted to increase cell efficiencies substantially. I will describe our research characterizing triplets and the singlet fission mechanism in conjugated organic molecules and their assemblies. The combined use of electronic and vibrational spectroscopy will be highlighted. I will connect lessons from these and other fundamental studies to the prospects for improving the efficiency of organic photovoltaics.

Triplet excitons, singlet fission, and prospects for improved organic photovoltaics

251st National Meeting (2016)

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