Patent ID: 7879733
Filing Date: 2011-02-01
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a silicon oxide layer over a semiconductor substrate; forming a silicon-rich oxynitride (SRON) layer directly on the silicon oxide layer, the SRON layer causing silicon contamination on a contacting surface portion of the silicon oxide layer by silicon diffusion from the silicon rich oxynitride layer; patterning the SRON layer to form an etching mask; etching a portion of the silicon oxide layer exposed by the etching mask to form a first contact hole; forming a conductive layer to fill the first contact hole to form a connection contact; removing all of the remaining SRON layer from the silicon oxide layer to expose an entire top surface of the silicon oxide layer; performing surface treatment on the exposed top surface of the silicon oxide layer by using plasma of a reaction gas containing oxygen to oxidize the silicon contaminated surface portion to recover into silicon oxide; forming a silicon nitride layer directly on the surface of the recovered silicon oxide portion of the silicon oxide layer; forming a mold layer over the silicon nitride layer; selectively etching the mold layer, in a first region of the semiconductor substrate, using the silicon nitride layer as an etching stop layer to form an opening hole through the mold layer and etching a portion of the silicon nitride layer exposed by the opening hole; forming a storage electrode, a dielectric layer, and a plate electrode in the opening hole; forming an upper insulating layer over the plate electrode; etching, in a second region of the semiconductor substrate, the upper insulating layer, the mold layer, the silicon nitride layer, and the silicon oxide layer to form a second contact hole; and forming a metal layer over the upper insulating layer to fill the second contact hole to form a metal line layer with a metal contact.