Frequency dependent capacitance and conductancevoltage characteristics of Al/Si3N4/p-Si(100) MIS diodes
The frequency dependent capacitancevoltage (CV-f) and conductancevoltage (G/wV-f) characteristics of the metalinsulatorsemiconductor (Al/Si3N4/p-Si) Schottky barrier diodes (SBDs) were investigated in the frequency range of 30kHz2MHz. For each frequency, the CV plots show a peak and the change in frequency has effects on both the intensity and position of the peaks. The C?2V plot gives a straight line in wide voltage region, indicating that interface states and inversion layer charge cannot follow the ac signal in the depletion region, especially in the strong inversion and accumulation region. For each frequency, the plot of series resistance gives a peak, decreasing with increasing frequencies. Also, it has been shown that the interface states density exponentially decreases with increasing frequency. The CV-f and G/wV-f characteristics confirm that the Nss and Rs of the diode are important parameters that strongly influence the electric parameters in MIS structure.
frequency dependence series resistance mis structure conductance method nitride passivation