R. Coehoorn and P. A. Bobbert Effects of Gaussian disorder on charge carrier transport and recombination in organic semiconductors physica status solidi (a) 209
Three-dimensional simulation of the charge carrier transport in organic light-emitting diodes (OLEDs) has led to the development of second generation OLED models, within which the energetic randomness of the molecular sites is taken into account. In contrast to more conventionally used first generation models, where the current density is a laterally uniform function of the position, the current density is found to be filamentary. In this Feature Article, it is discussed how within the framework of second generation modelling effective expressions for the charge carrier mobility and exciton generation may be obtained, which may be used in more efficient one-dimensional OLED simulations. Furthermore, the results of experimental validation studies for polymer and small-molecule devices are discussed.
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