PULSED PHOTOCONDUCTIVITY OF EMERALDINE-BA SE FILMS PREPARED BY VARIOUS METHODS

mThe decay kinetics of photoconductivity excited by nanosecond laser p ulses was studied at 12-300 K in emeraldine-base films obtained from. solutions in formic acid and N-methyl-2-pyrrolidinone. The experimenta l decay curves are well approximated by the stretch-exponent function F-1(t) = A(1)exp[-(t/tau(str))(beta)], where A(1) is the amplitude, ta u(str) is the decay time constant, and beta is the stretching power in dex, The presence of some amount of N-methyl-2-pyrrolidinone (plastici zer) in the emeraldine-base films decreases the relaxation time by thr ee orders of magnitude and masks the true values of beta and tau(str) parameters. Data for the emeraldine-base films show that the pulsed ph otoconductivity is highly sensitive to the conditions of sample prepar ation.