Current Mechanism in -Gated Metal-Oxide-Semiconductor Devices

Abstract

The present study aimed to examine the current density-voltage (J-V) characteristics of Al/HfO2/p-Si (MOS) structure at temperatures ranging between 100 and 320 K and to determine the structure’s current transport mechanism. The HfO2film was coated on a single side of the p-Si (111) crystal using the spin coating method. TheJ-Vmeasurements of the obtained structure at the temperatures between 100 and 320 K revealed that the current transport mechanism in the structure was compatible with the Schottky emission theory. The Schottky emission theory was also used to calculate the structure’s Schottky barrier heights (), dielectric constants () and refractive index values of the thin films at each temperature value. The dielectric constant and refractive index values were observed to decrease at decreasing temperatures. The capacitance-voltage (C-V) and conductance-voltage (G/ω-V) characteristics of Al/HfO2/p-Si (MOS) structure was measured in the temperature range of 100–320 K. The values of measuredCandG/ωdecrease in accumulation and depletion regions with decreasing temperature due to localized at Si/HfO2interface.