Mott-Schottky Purpose

The Mott-Schottky technique is used to measure the changes that occur in an electrochemical interface as its DC voltage is changed. A fixed-frequency, small-signal AC potential excitation is applied to an electrochemical cell. The impedance of the working-electrode interface is measured as a function of DC voltage.

The Mott-Schottky technique is a powerful tool for the study of electrode surfaces. Mott-Schottky plots are most often used for electrochemistry on semiconductor electrodes. They can also be used to study the voltage-dependent growth of films on an electrode.

A plot referred to by the name Mott-Schottky Plot is a graph of the capacitive and resistive components of impedance versus voltage. The resistance and capacitance are calculated assuming either a series-RC or a parallel-RC circuit. By default the parallel circuit is selected. You can change the selection under impedance options.