A model of charge injection from Ohmic contacts in disordered organic materials is presented, where the charge carriers are large (or small) polarons. We find that the space-charge-limited current is exponentially sensitive to the size of the molecules and the width of the polaron. For large molecules, we recover, at high fields, the usual Fowler-Nordheim-like dependence observed in many current-voltage characteristics of polymer light-emitting diodes.
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Bussac et al. (1997) studied this question.
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