Patent ID: 7232753
Filing Date: 2007-06-19
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising steps of: forming as part of a substrate a trench, a gate insulating film, and a poly gate on the substrate; forming a nitride film on the substrate; forming an LDD region in the substrate and beneath the nitride film by ion implantation using the poly gate as a mask; forming an oxide film on at least a portion of the nitride film on side portions of the poly gate; etching the oxide film to form a gate sidewall; ion implanting impurities in the substrate to form a source/drain using the gate and the sidewall as masks; vapor depositing PMD over the substrate including the gate sidewalls and the nitride film so as to form an upper layer and then planarizing the upper layer; etching the PMD to form a contact hole to the LDD region; and vapor depositing a barrier metal on the PMD, treating with heat, and filling up the contact hole.