Abstract
Relaxation processes of photoconductivity in emeraldine base (non-conductive form of polyaniline) are investigated under nanosecond laser excitation. Photocurrent relaxation data are approximated well by the stretched exponential function F1(t) = A1 exp[−(t/τstr)β] in the time interval from 0.45 to 40 ms. It was found that the parameters τstr and β of the function F1(t), which also characterize the energy distribution function of the electron traps, increased with time and allow an estimation of the decrease of the averaged trap depth dispersion in time. These parameters also demonstrated irregular behavior in the temperature range 180–300 K, forming a broad maximum at the temperatures of β-transition to the torsional motion of the rings along the polymer backbone in polyaniline from 180 to 260 K. © 1998 John Wiley & Sons, Ltd.
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