SEMICONDUCTOR ELECTRODES .21. CHARACTERIZATION AND BEHAVIOR OF N-TYPE FE2O3 ELECTRODES IN ACETONITRILE SOLUTIONS

The electrochemical behavior of Pb-doped single crystal, Ti-doped polycrystalline compacts, and chemical vapor deposited films of Fe2O3 was investigated in acetonitrile solutions. Details of the surface electronic band structure were obtained from capacitance and photo-excitation techniques and by comparing the cyclic voltammograms of various electroactive species of known standard potential to the Nernstian response at a Pt disk electrode. There is evidence that surface electronic states capable of mediating electron transfer exist at ~0.9 eV and ~1.8 eV negative of conduction bandedge. Results are interpreted in terms of a narrow conduction band of width dependent on the dopant level. © 1979, The Electrochemical Society, Inc. All rights reserved.