CHARGE-CARRIER TRANSPORT IN POLYIMIDES BASED ON 9,10-BIS(P-AMINOPHENYL)ANTHRACENE

Transient currents were measured by the time-of-flight technique in fi lms of aromatic polyimides based on 9,10-bis(p-aminophenyl)anthracene and a series of diimide fragments. The electric field and temperature dependences of the hole and electron drift mobilities were detected. I n amorphous films of the soluble polyimide with a phthalide group in t he diimide fragment, the drift mobility was found to reach the value o f 10(-4) cm(2) V-1 s(-1) at 5.5 x 10(5) V cm(-1) and 291 K. In the ins oluble polyimide films including the crystalline phase, the mobility w as lower by one or two orders of magnitude. This is attributed to the presence of cavities in the films of the insoluble polyimides. The app licability of known theoretical models describing temperature and elec tric field dependences of the drift mobility is discussed. (C) 1998 So ciety of Chemical Industry.