Abstract
A method for calculating the capacitance-voltage (C-U) characteristic of a planar ferroelectric film capacitor with allowance for the material nonlinearity is proposed. The nonlinear properties of the ferroelectric material are described in terms of the Ginzburg-Devonshir equation under the conditions of minimum free energy of the planar capacitor. An analysis of the results shows that the capacitance of a planar ferroelectric film capacitor can be calculated using the proposed elementary model with a relative error not exceeding 2%.
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