On the determination of the flat-band potential of a semiconductor in contact with a metal or an electrolyte from the Mott-Schottky plot

Possible sources of deviations of semiconductor/metal and semiconductor/electrolyte Schottky barriers from ideality are discussed. The conditions under which the flat-band potential of the barrier can be determined by capacitance measurements are deduced. Results on the flat-band potential and the position of the band edges for several semiconductor/electrolyte barriers are given.