Relationship between capacitance and conductance in MOS capacitors

In this work, we describe how the frequency dependence of conductance (G) and capacitance (C) of a generic MOS capacitor results in peaks of the functions G/omega and - omega dC/d omega. By means of TCAD simulations, we show that G/omega and -omega dC/d omega peak at the same value and at the same frequency for every bias point from accumulation to inversion. We illustrate how the properties of the peaks change with the semiconductor doping (N-D), oxide capacitance (C-OX), minority carrier lifetime (tau(g)), interface defect parameters (N-IT, sigma) and majority carrier dielectric relaxation time (tau(r)). Finally, we demonstrate how these insights on G/omega and -omega dC/d omega can be used to extract C-OX, N-D and tau(g) from InGaAs MOSCAP measurements