Patent ID: 8003458
Filing Date: 2011-08-23
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: forming a first transistor comprising a first active area in a first region of a substrate, a top surface of the first active area having a first height measured relative to a reference plane on the substrate, wherein forming the first transistor comprises using an epitaxial growth process, raising a previously formed top surface of the first active area of the first transistor to the top surface of the first active area having the first height, the epitaxial growth process being performed after covering a second region with a resist; forming a second transistor comprising a second active area in the second region of the substrate, a top surface of the second active area having a second height relative to the reference plane, wherein the second height is different from the first height; and forming an isolation region in a third region of the substrate, a top surface of the isolation region having a third height relative to the reference plane, the isolation region disposed proximate the first transistor and the second transistor, wherein the third height is different from the first height and the second height, and wherein the top surface of the second active area of the second transistor is elevated or recessed with respect to an entire top surface of the isolation region.