This thesis is based on the study of the electronic properties of PEOPT in thernform of AI/PEOPTIITO sandwich structure. An interface between aluminumrncontacts to PEOPT films were studied using complex impedance spectroscopyrnand current-voltage characteristic measurements. The current density-voltagerncurve is asymmetric and non-ohmic and shows Schottky barrier type rectification.rnThe complex impedance spectra are semi-circles that show the existence of arnregion depleted of mobile charge carriers. An equivalent circuit consisting of onernparallel RC circuit is envisaged as a model of the interface