Patent ID: 9365943
Filing Date: 2016-06-14
CPC Classification: C25D,H01L,H05K

Claim Text:
1. A method comprises: a) providing an electroplating composition comprising i) one or more sources of copper ions, ii) 5-100 ppb of 3-mercaptopropane sulfonic acid, salts thereof, or mixtures thereof and 1 mg/L to 50 mg/L of sulfopropyldisulfide, salts thereof, or mixtures thereof, wherein the 5-100 ppb of 3-mercaptopropane sulfonic acids and salts thereof, or mixtures thereof are added to the electroplating composition at an initial make-up of the electroplating composition without adding additional amounts of the 3-mercaptopropane sulfonic acid, salts thereof, or mixtures thereof during the life of the electroplating composition and electroplating cycle, iii) one or more additional brighteners, and iv) one or more levelers in amounts of 0.25 ppm to 1000 ppm, wherein the levelers are reaction products of an amine with an epoxide, wherein the amine has a formula: wherein R where Y b) immersing a substrate into the electroplating composition, the substrate includes a plurality of through-holes, wherein knees and walls of the plurality of through-holes are coated with a first copper layer; and c) electroplating a substantially uniform second copper layer on the first copper layer of the knees and the walls of the plurality of through-holes, wherein a throwing power of the knees is 80% and greater and a throwing power of the walls of the plurality of through-holes is 80% and greater.