Patent ID: 7015517
Filing Date: 2006-03-21
Classification: H01L

Abstract:
1. A semiconductor device comprising: a single crystal substrate formed of a substrate material; a dielectric layer overlying the single crystal substrate, the dielectric layer having at least one opening which has a first portion and an overlying second portion, the first portion having a predetermined depth and a predetermined width, wherein a ratio of the predetermined depth to the predetermined width is greater than one; a first material having a first portion and a second portion, the first portion of the first material filling the first portion of the at least one opening, defects for relaxing strain at an interface between the first material and the substrate material existing only within the first portion of the first material due to the ratio being greater than one; and the second portion of the first material and an overlying second material different than the first material filling the overlying second portion of the at least one opening, the second material having a thickness which is less than a critical thickness to maintain the second material in a strained state, the second portion of the first material being substantially defect free, the second material functioning as a channel for charge carriers.