RELAXATION SPECTRUM ANALYSIS OF SEMICONDUCTOR-ELECTROLYTE INTERFACE-TIO2

A new technique to evaluate the equivalent circuit elements of a semiconductor-electrolyte interface is presented. The technique is based on impedance measurements over a wide frequency range. We present results on n-type TiO2-aqueous electrolyte interfaces, which we can represent in terms of an equivalent circuit of passive elements. The equivalent circuit was interpreted in terms of two space charge layers with two different doping levels. The effect of surface treatment on the relative areas and on the lateral distribution of the two regions is also presented. © 1979, The Electrochemical Society, Inc. All rights reserved.