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 by condensation and experimentally found a kink at about 1.1 kbar on plots of log dc conductivity versus the square root of external pressure in a range from 0.1 to 10 kbar; a possibility of application of Mott's T/sup 1/4/ law to the higher temperature region of 290-400K and analogue trends of change between dc conductivity and spin concentration, with mole fraction of 4, 4' (hexafluoroisopropylidene diphthalic anhydride (HFDA)) introduced for improving the stability of properties. Plots of log dielectric constant versus the square root of pressure do not fully obey the linear relationship expected. A reasonable explanation of these experimental results is given.