DC conduction properties of Gadolinium-Indium oxide films deposited on Si(100)

摘要

Thin (Gd-In) oxide films were prepared by alternating deposition method on Si (P) substrates to form MOS structures in order to investigate their dc-electrical properties. These films were annealed at different conditions and characterised by X-ray fluorescence (XRF) and X-ray diffraction (XRD). The capacitance-gate voltage (C-V_g) dependence was used to study the effect of annealing conditions on the effective relative permittivity, concentration of the charges in the film, and determination the accumulation voltage region. The dc-current transfer in the samples is studied as a function of gate voltage at accumulation polarity and temperature in the range (293-390 K). The measurements showed ohmic conduction at low voltages. But, at voltages V > 0.4 V, the current transfer followed the trap-charge-limited space-charge-limited conductivity (TCLC-SCLC) mechanism characterised by exponential distribution of traps within the band gap. The total traps concentrations are 4.1 x 10~(24) m~(-3) and 2.2 x 10~(24) m~(-3) for samples annealed in oxygen atmosphere and in vacuum, respectively.