Electrochemical Deposition of ZnSe and (Zn,Cd)Se Films from Nonaqueous Solutions

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Abstract
Films of (Zn,Cd)Se and ZnSe were electrodeposited from dimethylsulfoxide solutions of elemental Se and the perchlorates of Zn and Cd. The composition of the mixed selenides could be controlled by variation of the deposition current density, utilizing diffusion control of the low concentrations of . The film composition was measured by X‐ray photoelectron spectroscopy and compared with the measured bandgap values extracted from optical transmission spectra. Photoelectrochemical photocurrent spectroscopy and contact potential difference (Kelvin probe) measurements both showed changes in apparent conductivity type with Zn concentration in the electrolyte from “n‐type” (low Zn) concentration to “p‐type” (high Zn). This phenomenon is discussed in terms of preferential surface trapping of either electrons or holes at the nanocrystallite surface. © 2000 The Electrochemical Society. All rights reserved.

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