Patent ID: 7494897
Filing Date: 2009-02-24
Classification: H01L

Abstract:
1. A method of fabricating a mixed substrate, the method comprising: providing two substrates each having respective bonding faces adapted to be bonded together, the bonding faces having crystalline portions and, wherein at least one of the bonding faces, includes regions of a material different from the crystalline portions; positioning the bonding faces and joining the bonding faces at an interface by molecular bonding to form bulk regions, in which the bonding faces are substantially crystalline, and stacked regions in which at least one of the bonding faces includes a region of the different material; and heating to consolidate the bond, wherein, during one of providing the two substrates or joining the bonding faces, impurity traps are created at the interface, such that any portion of the interface at a bulk region is within a predetermined distance from a trap, and wherein a misalignment between the crystalline portions when positioning the bonding faces is less than a predetermined misalignment threshold.