Abstract
Charge recombination (CR) kinetics of photogenerated ionic species in poly(N-vinylcarbazole) (hereafter abbreviated as PVCz) film doped with an electron acceptor is investigated by transient absorption spectroscopy in the submicrosecond to millisecond time regime. Characteristic initial concentration dependence of the CR kinetics is observed and is qualitatively explained by a spatially restricted hole-diffusion-controlled CR model. From the temperature dependence of CR kinetics combined with a charge transfer (CT) fluorescence decay measurement, it is concluded that a CR with a long-range electron-transfer mechanism occurs under low-temperature conditions. Applicability of a 3-D random walk model in an energy disordered lattice to the CR kinetics is examined by means of a Monte Carlo simulation technique, and it is found that the spatial restriction condition is necessary to reproduce the CR kinetics in a PVCz film.
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