Abstract
The formation of mobile charges in a roll-to-roll processed poly-3-hexylthiophene-fullerene bulk heterojunction film is observed directly by using transient terahertz spectroscopy with sub-100fs temporal resolution. The transient terahertz ac conductivity reveals that 20% of the incident pump photons are converted into highly delocalized charges within the 40fs, 3.1eV pump pulse duration, which then rapidly becomes localized within 120fs. Approximately 2/3 of these carriers subsequently decay, possibly into an exciton, on a 1ps time scale.
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