Journal of The Electrochemical Society, 161 (12) D663-D665 (2014) D663 On the Displacement of Adsorbed Polyethylene Glycol by

Displacement of the suppressor polyethylene glycol (PEG) by the accelerant 3-mercapto-1-propanesulfonate (MPS) during copper electrodeposition was studied by a chronoamperometric addition technique. Displacement of PEG occurs through a process of MPS domain nucleation, mass-transfer limited domain expansion and an asymptotic approach to equilibrium between MPS in solution and that on the surface. An isotherm is proposed to account for the equilibrium coverage over a wide range of MPS concentrations, and the nearest neighbor separation between adsorbed MPS molecules during deposition is estimated. © The Author(s) 2014. Published by ECS. This is an open access article distributed under the terms of the Creative Common