Abstract
Using a substrate curvature method, stress was monitored in-situ in acidic CuSO4 electrolytes with and without chloride as an additive. Chloride in the electrolyte considerably reduced the tensile stress. Chloride-free and chloride-containing electrolytes also showed very different behaviors after interruption of electrodeposition. In chloride-free electrolyte, the tensile steady-state stress observed during deposition changed to compressive stress on interruption of the deposition. However, in chloride-containing electrolyte, the stress became even more tensile on interruption of deposition. The lower tensile stress in the presence of chloride is explained using a model based on the grain boundary diffusivity of copper and possible mechanisms for the behavior on current interruption are discussed.
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