Patent ID: 8106467
Filing Date: 2012-01-31
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate including a first active region of a first conductivity type; a first transistor including a gate electrode disposed over the first active region, a source region and a drain region of a second conductivity type opposite to the first conductivity type formed in the first active region on both sides of the gate electrode; a first sidewall structure disposed on sidewalls of the gate electrode of the first transistor and on a surface of the first active region on both sides of the gate electrode; and a first stress control film accumulating stress therein and covering the gate electrode of the first transistor, the first sidewall structure and the first active region, wherein: the first sidewall structure comprises a first portion extending along partial upper sidewalls of the gate electrode, a second portion extending from partial lower sidewalls of the gate electrode to partial surfaces of the first active region, a third portion extending along partial surfaces of the first active region outside the second portion, and a fourth portion facing the sidewalls of the gate electrode and an upper surface of the first active region across the first to third portions, and a Young's modulus of the first portion is lower than a Young's modulus of the third portion, and a Young's modulus of the first portion is lower than a Young's modulus of the second portion; the source and drain regions of the first transistor is an n-type and the stress in the first stress control film is tensile stress, or the source and drain regions of the first transistor is a p-type and the stress in the first stress control film is compressive stress; an edge of the second portion far from the gate electrode is further from the gate electrode than a surface of the fourth portion facing the sidewall of the gate electrode, and Young's modulus of the third portion is higher than Young's modulus of the second portion on the partial lower sidewalls of the gate electrode, and is higher than Young's modulus of the second portion further from the gate electrode than the surface of the fourth portion facing the sidewall of the gate electrode.