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We report on the electrical characteristics of light-emitting electrochemical cells based on a methyl substituted ladder-type poly͑paraphenylene͒ ͑m-LPPP͒. Current-voltage (I-V) characteristics and capacitancevoltage (C-V) plots are used to track the formation of the highly conductive contacts, the initial diffusive carrier transport regime, the onset of a net voltage drop across the polymeric bulk, and the final resistive behavior of the device in which carriers are mostly driven by drift. The analysis of the C-V plots reveals a strong increase of the capacitance at the threshold as a signature of the large carrier injection through the contacts and their diffusion through the active layer. From the physical analysis of the device behavior an electrical model is drawn. PRB 61 M. SAMPIETRO et al.

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