Abstract
We report electrodeposition of from electrolytes that contain thiocyanate as a complexing agent to cathodically shift the reduction potential of Cu(II). In the presence of thiocyanate, the peak reduction currents for Cu(II) and Ga(III) during cyclic voltammetry occur at potentials that differ by only , even though the standard reduction potentials of the uncomplexed species differ by about . Stoichiometric deposits are obtained by the induced codeposition mechanism at vs SCE and 2.75 from electrolytes with ratios ranging from 0.5 to 1.5. The stoichiometry is controlled by the thermodynamic driving force associated with stable compound formation, as illustrated by the anodically shifted reduction peak obtained in cyclic voltammograms of electrolytes containing all three elemental species. Oxygen incorporation into the electrodeposit is observed, because electrodeposition of stoichiometric appears to be immediately followed by Ga oxidation. Methods for removing oxygen from the electrodeposited film are discussed.
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