Time-resolved transport in conjugated polymers

We present a range of measurement techniques (time-resolved and CW) of vari ous polymers in a variety of LED configurations. Using time-resolved pulsed electrical excitation, we are able to provide direct evidence for the moti on of both types of carriers. We use pulses to probe the decay of carriers on time scales from nanosecond to millisecond. We address the issue of puls ed vs. CW properties and find that the functional form (power law) of the c urrent-voltage curves is affected by the measurement technique; we also dis cuss a method to produce "intrinsic" curves. We introduce the method of usi ng double electrical pulses to probe the dynamics of the stored charges aft er the application of a pulse. (C) 2000 Elsevier Science S.A. All rights re served.