On the profile of temperature dependent series resistance in Al/Si3N4/p-Si (MIS) Schottky diodes
The temperature dependence of capacitancevoltage (CV) and conductancevoltage (G/wV) characteristics of metalinsulatorsemiconductor (Al/Si3N4/p-Si) Schottky barrier diodes (SBDs) was investigated by considering series resistance effect in the temperature range of 80300K. It is found that in the presence of series resistance, the forward bias CV plots exhibit a peak, and experimentally show that the peak positions with a maximum at 260K shift toward lower voltages with increasing temperature. The CV and (G/wV) characteristics confirm that the interface state density (Nss) and series resistance (Rs) of the diode are important parameters that strongly influence the electric parameters of MIS structures. The crossing of the G/wV curves appears as an abnormality compared to the conventional behavior of ideal Schottky diode. It is thought that the presence of series resistance keeps this intersection hidden and unobservable in homogeneous Schottky diodes, but it appears in the case of inhomogeneous Schottky diode. In addition, the high frequency (Cm) and conductance (Gm/w) values measured under both reverse and forward bias were corrected for the effect of series resistance to obtain the real diode capacitance.
temperature dependence series resistance mis structure conductance method nitride passivation