Study of pressure and temperature dependence of electrical properties in new intrinsic semiconducting polyacene quinone radical polymer

Abstract

We have synthesized several new polyacene quinone radical co-polymers first by condensation and experimentally found a kink at about 1.1 kbar on plots of log d.c. conductivity versus the square root of external pressure in a range from 0.1 to 10 kbar. we consider the possibility of the application of Mott's T/sup 1/4/ law to the higher temperature region of 290-400 K and analyse trends of change between d.c conductivity and spin concentration with mole fraction of 4,4'(hexafluoroisopropylidene diphthalic anhydride) (HFDA) (introduced to improve the stability). Plots of log dielectric constant versus the square root of pressure do not fully obey the linear relationship expected by Pohl. Here we give a reasonable explanation of these experimental results.