<br/>The unusual features of charge generation in blends of conjugated polymers and fullerenes, which constitute the active material of so-called organic photovoltaic devices, are the high yields, the ultrafast photo-generation times, and the extremely slow recombination times. All of which occur in a medium, albeit a complex blend, of low dielectric constant. Conventional approaches to explain the photo-induced electron transfer phenomena in these systems are rare and a fundamental understanding of how the charges are created so effectively, and yet do not recombine, is required. This presentation will focus on the investigation of two particular systems, where the role of charge delocalization as a contributing factor is explored. The first will examine the role of the solid-state microstructure of conjugated polymer films on influencing the charge generation step when doped with phthalocyanines and fullerenes. The second, a study of polymer-wrapped single-walled carbon nanotubes dispersed in a low dielectric toluene solvent. Studies using nanosecond, flash photolysis time-resolved microwave conductivity (<i>fp</i>-TRMC), femto-second transient absorption spectroscopy and time-resolved photoluminescence spectroscopy will be reported.

Effects of charge delocalization on long-lived charge carriers in low dielectric media

251st National Meeting (2016)

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