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 t he macroscopic dielectric properties of a transport polymer is explore d by employing a ''vapor doping'' procedure as a means of reversibly v arying its bulk dielectric properties. Under controlled uptake and sub sequent outgassing of polar CH3CN vapor, the hole drift mobility of th e transport polymer PTPB is monitored, while its relative dielectric c onstant is reversibly varied between epsilon=3.7, its undoped value, a nd epsilon=6.0, its saturation value at room temperature. There is nei ther 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 polycarbona te, an increase in dispersion is clearly indicated but the transit tim e of the fastest carriers remains unaffected.