Cadmium selenide electrodeposited by ECALE: electrochemical characterization and preliminary results by EXAFS

The electrochemical atomic layer epitaxy methodology was employed for the growth of CdSe on Ag(111). for up to 50 deposition cycles. The voltammetric analysis of the first Cd-upd peak indicates a mechanism of two-dimensional growth: this is consistent with layer-by-layer growth, which is a good prerequisite for epitaxial deposits. The amount of Cd and Se deposited in a given number of cycles, as determined by stripping the deposits first anodically and then cathodically. is a function of the number of cycles employed, again suggesting a layer-by-layer growth. The charges associated with each layer of Cd and Se. 75 muCcm(-1). give the right 1:1 stoichiometric ratio between the elements, indicating the formation of a compound. Preliminary results from a structural analysis carried out by extended X-ray absorption spectroscopy (EXAFS) at the Se K edge confirm the presence of Cd neighbors around Se. (C) 2004 Elsevier B.V. All rights reserved.