Patent ID: 6696338
Filing Date: 2004-02-24
Classification: H01L

Abstract:
A method for forming a ruthenium (Ru) storage node of a semiconductor device, comprising the steps of:a) forming an insulating layer on a substrate; b) forming openings in the insulating layer by etching the insulation layer to expose plugs including a barrier layer containing conductive nitride contacted to the substrate; c) depositing a Ru layer along the profile of the insulation layer and the openings; d) filling a photoresist in the openings; e) etching the Ru layer until the insulation layer between neighboring openings is exposed and forming isolated Ru storage nodes with the Ru layer in the openings; and f) removing the photoresist remaining in the openings with a cleaning solution consisting of H2SO4 and H2O2 in a ratio of about 50:1.