Patent ID: 8846487
Filing Date: 2014-09-30
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising: forming a direct silicon bonded substrate wherein a second silicon layer with one of a (100) or (110) crystal orientation is bonded to a first silicon layer of a handle substrate with the other of the (100) or (110) crystal orientation; forming a pad oxide layer over the second silicon layer; forming a nitride layer over the pad oxide layer, wherein the nitride layer is deposited as a non-stressed nitride layer; forming an isolation trench within the direct silicon bonded substrate through the non-stressed layer, the second silicon layer and into the first silicon layer; after forming the isolation trench, performing a patterned implant to amorphize a region of the second silicon layer; performing solid phase epitaxy at a temperature of less than about 700° C. to recrystallize the amorphized region of the second silicon layer to the same crystal orientation as the first silicon layer; and after performing the solid phase epitaxy, filling the isolation trench with an isolation material.