Patent ID: 7875520
Filing Date: 2011-01-25
Classification: H01L

Abstract:
1. A method of forming a CMOS transistor, comprising: providing a semiconductor substrate having at least a first active area, at least a second active area, and a respective gate structure formed in the first active area and the second active area; forming a first light doped drain beside the gate structure of the first active area; forming a sacrificial layer on the semiconductor substrate; performing an etch process to etch the sacrificial layer formed in the first active area and a surface of the semiconductor substrate beside the gate structure of the first active area and to form at least a recess beside the gate structure of the first active area; performing a selective epitaxial growth process to form an epitaxial layer in the recess; removing the sacrificial layer; and forming a second light doped drain beside the gate structure of the second active area after the sacrificial layer is removed.