Inventors:
Joseph Cole - Redwood City CA
Rudolf P. Sedlak - Mountain View CA
Assignee:
RD Chemical Company - Mountain View CA
International Classification:
C23C 2200
US Classification:
148243, 148273, 148282, 148284, 427 97, 427 98, 4271263
Abstract:
The invention features and methods and compositions for oxide production on a Copper substrate, e. g. , a Copper or Copper alloy substrate, to provide for improved adhesion of Copper substrate to polymeric material, e. g. , such as used in manufacture of printed circuit boards. The oxide-producing compositions of the invention, which may be either acidic or ammoniacal, comprise 1) a source of Cu (Cupric) ions; 2) a source of a primary electrolyte that is non-interactive with Copper ions; 3) a Cuprous ligand, e. g. , a halide ion, preferably chloride, which also serves as a secondary electrolyte; and 4) an optional organic. Acidic oxide-producing compositions comprise a strong acid as the primary electrolyte. The primary electrolyte of ammoniacal oxide-producing compositions is a non-interactive, ammonium salt of acid, which provides a highly soluble Cupric ammonium salt. The secondary electrolyte of the oxide-producing compositions is selected so as to be compatible with the primary electrolyte.