A method for forming a strained silicon layer of semiconductor material.
The method includes providing a deformable surface region having a first
predetermined radius of curvature, which is defined by R(1) and is
defined normal to the surface region. A backing plate is coupled to the
deformable surface region to cause the deformable surface region to be
substantially non-deformable. The method includes providing a first
substrate (e.g., silicon wafer) having a first thickness. Preferably, the
first substrate has a face, a backside, and a cleave plane defined within
the first thickness. The method includes a step of overlying the backside
of the first substrate on a portion of the surface region having the
predetermined radius of curvature to cause a first bend within the
thickness of material to form a first strain within a portion of the
first thickness. The method provides a second substrate having a second
thickness, which has a face and a backside. The method includes a step of
overlying the face of the second substrate on a portion of the face of
the first substrate to cause a second bend within the thickness of
material to form a second strain within a portion of the second
thickness. A step of joining the face of the second substrate to the face
of the first substrate form a sandwich structure while maintaining the
first bend in the first substrate and the second bend in the second
substrate. Preferably, joining occurs using a low temperature process
such as plasma activated bonding or the like.