Patent ID: 9190333
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device including an n-channel transistor and a p-channel transistor, comprising steps of: (a) forming a first gate electrode of the n-channel transistor and a second gate electrode of the p-channel transistor over a semiconductor substrate; (b) forming a first silicon oxide film over the semiconductor substrate and a side wall of the first gate electrode, forming a first side wall silicon oxide film of the n-channel transistor; (c) forming the first silicon oxide film over the semiconductor substrate and a side wall of the second gate electrode, forming a second side wall silicon oxide film of the p-channel transistor; (d) forming a first silicon nitride film over the first side wall silicon oxide film of the n-channel transistor and the first silicon oxide film over the substrate, forming a first side wall silicon nitride film of the n-channel transistor; (e) forming the first silicon nitride film over the second side wall silicon oxide film of the p-channel transistor and the first silicon oxide film over the substrate, forming a second side wall silicon nitride film of the p-channel transistor; (f) forming a second silicon nitride film over the n-channel transistor and the p-channel transistor; (g) forming a first mask film over the n-channel transistor in order to expose the p-channel transistor; (h) etching the second silicon nitride film of the p-channel transistor and the second side wall silicon nitride film of the p-channel transistor by using the first mask film as a mask; (i) removing the first mask film; and (j) forming a third silicon nitride film over the n-channel transistor and the p-channel transistor.