Patent ID: 6916737
Filing Date: 2005-07-12
Classification: H01L,Y10S

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming a contact hole in an insulating layer; filling the contact hole with a copper layer; planarizing the copper layer; removing a copper oxide layer parasitically formed on the copper layer, wherein removing the copper oxide layer comprises performing a plasma process using nitrogen gas, and wherein removing the copper oxide layer exposes a surface of the copper layer; forming a copper nitride layer having a thickness of about 50 to 200 Å on the surface of the copper layer; depositing a copper barrier layer on the insulating layer and the copper nitride layer, the copper barrier layer being a nitride layer having a thickness of about 50 to 200 Å; depositing an upper insulating layer on the copper barrier layer; and forming an upper contact hole in the copper barrier layer and the upper insulating layer to expose the copper nitride layer.