OPTICAL AND ELECTRICAL PROPERTIES OF ELECTROCHEMICALLY DOPED n- AND p-TYPE POLYTHIOPHENES.

Absorption spectra have been measured on polythiophene films subjected to electrochemical Bu//4N** plus doping. The spectra show essentially the same evolution as those for BF//4** minus doping, i. e. , peaks at 0. 6 to about 0. 7 ev and 1. 5 to about 1. 8 ev appear upon doping in addition to the band-to-band absorption peak at 2. 6 ev. Propagation velocities of electrochemical doping of Bu//4N** plus and BF//4** minus along polythiophene films were estimated to be on the order of 10** minus **3 cm/sec.