Patent ID: 7754573
Filing Date: 2010-07-13
Classification: H01L,Y10S

Abstract:
1. A method for manufacturing a semiconductor device comprising: forming a gate pattern on a substrate; forming a first oxide layer on horizontal and vertical surfaces of the gate pattern; sequentially forming a second oxide layer, a first silicon nitride layer, and a second silicon nitride layer over exposed surfaces of the substrate and the first oxide layer; performing a first etching process to remove horizontal portions of the first and second silicon nitride layers such that only vertical portions of the first and second silicon nitride layers remain along the vertical surfaces of the second oxide layer; forming source/drain regions in the substrate; removing the vertical portions first and second silicon nitride layers; forming a third silicon nitride layer over the second oxide layer; and performing a second etching process to remove horizontal portions of the third silicon nitride layer and the second oxide layer such that only vertical portions of the third silicon nitride layer and the second oxide layer remain along the vertical surfaces of the second oxide layer.