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The exciton diffusion process in a poly (p-phenylene vinylene) - (PPV-) based derivative is investigated using time-resolved photoluminescence in conjugated polymer/fullerene heterostructures. The decay of the luminescence in the polymer/fullerene heterostructures is governed by exciton diffusion and subsequent dissociation at the polymer/fullerene interface. The decay curves of polymer layers with varying thickness are consistently modeled using an exciton diffusion constant of 310^-40. 3em{0ex}cm^2∕s. The resulting exciton migration radius amounts to 60. 3em{0ex}nm, which is a measure for the active part of the PPV/fullerene heterojunction for photovoltaic applications.
Markov et al. (Thu,) studied this question.
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