Patent ID: 7863646
Filing Date: 2011-01-04
Classification: H01L

Abstract:
1. A transistor structure comprising: a substrate; a first type of transistor positioned in a first area of said substrate; a second type of transistor positioned in a second area of said substrate; a first type of conformal nitride stressing layer positioned above said first type of transistor; a second type of conformal nitride stressing layer positioned above said second type of transistor; a first type of oxide stressing layer positioned above said first type of transistor, wherein a bottom side of said first type of oxide stressing layer that is adjacent said first type of transistor has a conformal shape matching a corresponding shape of said first type of conformal nitride stressing layer, and wherein a top side of said first type of oxide stressing layer that is opposite said bottom side of said first type of oxide stressing layer comprises a planar surface; and a second type of oxide stressing layer positioned above said second type of transistor, wherein a bottom side of said second type of oxide stressing layer that is adjacent said second type of transistor has a conformal shape matching a corresponding shape of said second type of conformal nitride stressing layer, and wherein a top side of said second type of oxide stressing layer that is opposite said bottom side of said second type of oxide stressing layer comprises a planar surface, wherein said first type of oxide stressing layer comprises a compressive oxide stressing layer, and wherein said second type of oxide stressing layer comprises a tensile oxide stressing layer.