EFFECTS OF DOPANTS AND POLYMER STRUCTURES ON ELECTRICAL-CONDUCTIVITY OF ORGANOSILICON POLYMERS

A series of organosilicon polymers comprising disilanylene-phenylene, disilanylene-ethynylene and disilanylene-(bisethynylene-phenylene) cha ins carrying dibutyl or phenyl and methyl groups as side chains, and p olysilanes carrying alkyl, aromatic or heteroaromatic side chains were synthesized. The electrical conductivities of their polymers doped wi th electron accepters such as I-2, FeCl3 and SbF5 were measured by usi ng vapor-phase doping. The electrical conductivities of organosilicon polymers doped with I-2 showed a good correlation with the ionization potentials of the original polymers. In contrast, in the case of SbF5 doping, the degradation of polymers occurred and every polymer gave th e same order of conductivity, 10(-4)-10(-3) S/cm. The polymers carryin g heteroaromatic substituents gave the higher conductivity by doping w ith I-2, while in the case of the polymers carrying phenyl groups, the conductivity was enhanced by doping with FeCl3. (C) 1998 Elsevier Sci ence S.A. All rights reserved.