ELECTROCHEMICAL BEHAVIOR OF AN AQUEOUS ELECTROLYTE-I-DOPED ZNSE JUNCTION IN THE DARK AND UNDER ILLUMINATION

Aqueous electrolyte/I-doped ZnSe junctions have been electrochemically investigated either in the dark or under monochromatic illumination. Large dark potential ranges of stability (at least 3V) have been found in electrolytic media of pH 0, 6.3, and 14. It has been possible to determine the flatband potential values Vfb by electrical and optical measurements in the media studied. A Nernstian flatbana-pH dependence has been observed by the two methods for (111) oriented electrode surfaces. For (110) surface orientation, electrical measurements in media of pH > 6 give a different variation of Vfb. These potentials are more negative than for other II-VI compounds previously studied (-1.65 to -2.45 V/NHE). Determination of a deep acceptor level has been possible: It is located at 0.68 eV below the conduction band. © 1979, The Electrochemical Society, Inc. All rights reserved.