Abstract
Solution equilibrium characteristics of two electroless copper baths containing EDTA and tartrate as the complexing agents were studied as functions of pH. Equilibrium diagrams were constructed for both Cu-tartrate and Cu-EDTA systems. It was determined that copper is chiefly complexed as Cu2L2 in acidic conditions and as Cu(OH)2L2−4 in alkaline conditions in the tartrate bath, and as CuA−2 in the EDTA bath, where L and A are the complexing tartrate and EDTA ligands, respectively. Electroless copper deposition rates were studied from a tartrate bath on thermally activated palladium-catalysed polyimide substrates as functions of copper and formaldehyde concentrations, and pH.
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Ramasubramanian, M., Popov, B.N., White, R.E. et al. Solution equilibrium characteristics of electroless copper deposition on thermally-activated palladium-catalysed polyimide substrates. Journal of Applied Electrochemistry 28, 737–743 (1998). https://doi.org/10.1023/A:1003202413045
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DOI: https://doi.org/10.1023/A:1003202413045