AC conductivity of vacuum deposited phenylene-vinylene oligomers/porous silicon structures

The electrical impedance of thin films of phenylene-vinylene oligomer (PVO) vacuum-deposited on to porous silicon (PS) substrates is studied in a wide range of temperatures (10-350 K) and ac electric field frequencies. It is shown that the PVO films are susceptible to the influence of the environmen t - its conductivity decreases orders of magnitude when the atmosphere is e vacuated. The data of measurements are analyzed using the physical model wh ich implies the participation of both PVO and PS layers in the electrical c onductivity process. (C) 2000 Elsevier Science S.A. All rights reserved.