Poole-Frenkel electrical conduction in europium oxide films deposited on Si(100)

Thin Eu2O3 films were prepared on Si (P) substrates to form MOS devices. The oxide crystal structure was determined by X-ray diffraction (XRD). The electrical transport properties of the devices with amorphous and crystalline Eu oxide were investigated. The current-voltage and current-temperature characteristics suggest a Poole-Frenkel (PF) type mechanism of carrier transport through the device when the applied field is more than 105 V/cm. A deviation from PF leakage current course was found and attributed to the current carrier trapping. We have also observed that, the dielectric spectra of MOS structure are different when the insulator is an amorphous or crystalline thin film. From which we calculate the relaxation time (T) of the interface (insulator/semiconductor) dipoles. (C) 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.