Patent ID: 7579259
Filing Date: 2009-08-25
Classification: C30B,H01L

Abstract:
1. A method for producing an epitaxied structure consisting of depositing a material by columnar epitaxial growth on a crystalline face of a substrate ( 2 ), of continuing deposit until the columns ( 4 ) join together and lead to a continuous layer ( 5 ), characterized in that it consists of providing the face of the substrate with a periodic array of bumps ( 3 ) on a nanometric scale each bump ( 3 ) having a support zone ( 35 ) for a column ( 4 ), and being obtained directly or indirectly from an array crystalline defects and/or strain fields created within a crystalline region ( 16 ) located in the vicinity of a bonding interface ( 15 ) between two elements ( 11 , 12 ) comprising crystalline material and having crystalline lattices with a twist and/or tilt angle and/or having interfacial lattice mismatch, able to condition the period ( 38 ) of the array of bumps ( 3 ), the period ( 38 ) of the array, the height ( 36 ) of the bumps and a size of their support zone ( 35 ) being adjusted so that the continuous layer ( 5 ) has a critical thickness ( 39 ) greater than the thickness obtained with an epitaxy conducted without the presence of bumps.