INFLUENCE OF EFFECTIVE-MEDIUM DIELECTRIC-CONSTANT ON ELECTRONIC TRANSPORT IN AN ARYLAMINE-CONTAINING GLASSY POLYMER

The extent to which transport behavior can be simply correlated with the macroscopic dielectric properties of a transport polymer is explored by employing a ''vapor doping'' procedure as a means of reversibly varying its bulk dielectric properties. Under controlled uptake and subsequent outgassing of polar CH3CN vapor, the hole drift mobility of the transport polymer PTPB is monitored, while its relative dielectric constant is reversibly varied between epsilon=3.7, its undoped value, and epsilon=6.0, its saturation value at room temperature. There is neither an associated change in hole drift mobility nor in the dispersion of injected carrier transit times. When the same procedure is carried out on a closely related molecularly doped polymer TPD in polycarbonate, an increase in dispersion is clearly indicated but the transit time of the fastest carriers remains unaffected.