Patent ID: 8216368

Claim:
A multilayer substrate for producing a wafer with an epitaxial layer of improved quality, the substrate comprising: a support substrate; a first region of weakness within the support substrate for dividing the support substrate into a support portion and a support remainder portion that are disposed on opposite sides of the first region of weakness, and being configured for facilitating detachment of the support portion from the support remainder portion, wherein the support portion is configured for providing support during epitaxial growth of an epitaxial layer; a nucleation portion that forms part of a nucleation substrate that is bonded to the support portion to improve conditions for growing the epitaxial layer thereon; and a second region of weakness disposed within the nucleation substrate for dividing the nucleation substrate into the nucleation portion and a nucleation remainder portion that are disposed on opposite sides of the second region of weakness, and being configured for facilitating detachment of the nucleation portion from the nucleation remainder portion, wherein the nucleation and support portions are disposed between the first and second regions of weakness, wherein the first and second regions of weakness are such that the energy budget required to effect detachment at the first region of weakness is greater than the energy budget required to effect detachment at the second region of weakness.