Patent ID: 6653194
Filing Date: 2003-11-25
Classification: H01L

Abstract:
A method for forming a contact hole in a semiconductor device comprising the steps of:forming a pad oxide layer and a first silicon nitride layer on a silicon substrate; forming a trench on a part of the entire structure formed in the above step and forming an oxide layer on the entire structure including the trench; selectively etching the oxide layer so that the oxide layer remains only within the trench; forming a second silicon nitride layer over the entire structure including the oxide layer remaining in the trench planarizing the second silicon nitride layer and a part of the first silicon nitride layer, so that the top surface of the first silicon nitride layer is exposed, and then selectively etching a part of the first silicon nitride layer and the pad oxide layer to define a gate region; forming a gate within the etched part for defining a gate region in the first silicon nitride layer and the pad oxide layer, and then forming a source/drain in the silicon substrate under each side of the gate; and forming an interlayer oxide film over the above structure and selectively etching the interlayer oxide film to form a contact hole in the interlayer oxide film which exposes the source/drain.