Patent ID: 6794292
Filing Date: 2004-09-21
Classification: C23G,H01L

Abstract:
An extrusion-free wet cleaning process for post-etch Cu-dual damascene structures, the process comprising:providing a wafer comprising a silicon substrate and at least one post-etch CU-dual damascene structure, the post-etch Cu-dual damascene structure having a via structure exposing a portion of a Cu wiring line electrically connected with an N+ diffusion region of the silicon substrate and a trench structure formed on the via structure; executing an oxidation step by applying a diluted H2O2 solution to the wafer to slightly oxidize the surface of the exposed Cu wiring line; and washing away cupric oxide generated in the oxidation step by means of a cupric oxide cleaning solution containing diluted HF, NH4F or NH2OH having a pH of above 7.