Patent ID: 6875474
Filing Date: 2005-04-05
Classification: C23C

Abstract:
1. An electroless copper plating solution, comprising: a copper-containing compound; a reducing agent that is a source of hypophosphite ions; at least one accelerator compound, wherein the accelerator compound is a source of a formamidine disulfide compound; and a (N-(2-hydroxyethyl)ethylenediaminetriacetic acid salt (HEDTA) compound, wherein the HEDTA compound, the copper-containing compound, and the accelerator compound react to form the formamidine disulfide compound, wherein the formamidine disulfide compound accelerates the oxidation of the reducing agent and the reduction of the copper-containing compound, and wherein the formamidine disulfide compound is formed in an amount to reduce copper (II) ions onto the structure as the metal film at a deposition rate from about 2 to 16 micrometers/hour.