Analysis of interface states and series resistance of Ag/SiO2/n-Si MIS Schottky diode using currentvoltage and impedance spectroscopy methods
The electrical characteristics and interface state density properties of Ag/SiO2/n-Si metalinsulatorsemiconductor diode have been analyzed by currentvoltage and impedance spectroscopy techniques. The electronic parameters such as barrier height, ideality factor and average series resistance were determined and were found to be 0.62eV, 1.91 and 975.8?, respectively. The calculated ideality factor shows that Ag/SiO2/n-Si structure obeys a metalinterfacial layersemiconductor configuration rather than ideal Schottky barrier diode. The interface state density of the diode is of order of ?1011eV?1cm?2. The dielectrical relaxation mechanism of the diode is analyzed by ColeCole plots, indicating the presence of single relaxation mechanism. It is evaluated that the interfacial oxide layer modifies electrical parameters such as interface state density, series resistance and barrier height of Ag/SiO2/n-Si diode.
metalinsulatorsemiconductor diode interfacial state density ac conductance