Charge carrier transport in polyimides based on 9,10-bis(p-aminophenyl)anthracene

Abstract

Transient currents were measured by the time-of-flight technique in films 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. In amorphous films of the soluble polyimide with a phthalide group in the diimide fragment, the drift mobility was found to reach the value of 10-4cm2V-1s-1 at 5·5×105Vcm-1 and 291K. In the insoluble polyimide films including the crystalline phase, the mobility was lower by one or two orders of magnitude. This is attributed to the presence of cavities in the films of the insoluble polyimides. The applicability of known theoretical models describing temperature and electric field dependences of the drift mobility is discussed. © 1998 Society of Chemical Industry