Patent ID: 7858964

Claim:
A semiconductor device comprising: a substrate, the substrate comprising a first layer, a first recrystallized layer of a first thickness on a first portion of the first layer, and a second recrystallized layer of a second thickness on a second portion of the first layer, the first layer having a first intrinsic stress, the first recrystallized layer having a second intrinsic stress, and the second recrystallized layer having a third intrinsic stress, wherein the second intrinsic stress is larger than the first intrinsic stress and the third intrinsic stress; a first stressor layer over the first recrystallized layer and a second stressor layer over the second recrystallized layer, and the first and the second stressor layers, the first and second recrystallized layers are separated by an isolation trench; and wherein the isolation trench is in the first layer.