Patent ID: 6224737
Filing Date: 2001-05-01
Classification: C25D,H01L

Abstract:
A method for electroplating copper in a trench, the steps comprising:providing a semiconductor structure and a trench formed therein; said semiconductor structure having an upper surface, and said trench having a bottom, and lower and upper opposing side walls and further having a predetermined depth and width;applying a voltage to said trenched semiconductor structure inducing a first field proximate said trench bottom, and a second field proximate said trench upper opposing side walls and said semiconductor structure upper surface proximate said trench; said second field being greater than said first field creating a bias field;immersing said semiconductor structure into an electroplating solution; said electroplating solution including a predetermined concentration of brighteners and a predetermined concentration of levelers; the concentration of said brighteners being greater proximate said trench bottom and the concentration of said levelers being greater proximate said trench upper opposing side walls and said semiconductor structure upper surface proximate said trench; anddepositing a copper layer having a predetermined thickness within said trench and blanket filling said semiconductor structure upper surface.