Electrical properties of poly(meta/para)phenylene

In this study, we investigate the ac electrical response of the ITO/PMPP/Al devices for medium- and short-chain lengths. From the conducting mechanisms and the dielectric behavior of ITO/PMPP/Al structures using current–voltage measurements, the transport characteristics of electrons and holes have been analyzed. It was found that the electron and hole currents are space-charge limited with traps. Moreover, carrier transport in PPMT has been studied as a function of frequency and dc bias and the devices are modeled with the equivalent circuits for short- and medium-length chains. Based on the results of the impedance analysis, conducting mechanism and dielectric behaviors are discussed.