The Effect of Pulsed Reversed Current on the “Hole Throwing Power” of Acid Copper Electrolytes containing Organic Additives

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Abstract
The use of pulsed reversed current for the electrodeposition of copper from acidic electrolytes containing a combination of polyethers, sulphopropyl sulphides and chloride ions can under suitable conditions give an enhanced throwing power due to a change in the polarisation characteristics of the electrolyte. Improvements in “hole throwing power” are not obtained when single additives are present, but a combination of additives is required to produce enhanced throwing power. In a laboratory prepared electrolyte, the best results have been obtained using an anodic/cathodic ratio of 3:1 and a cathodic/anodic time ratio of 20:1. These results are comparable with those obtained using commercial electrolytes.

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