Patent ID: 6335258
Filing Date: 2002-01-01
Classification: H01L,Y10S

Abstract:
Production method for a thin film made of a first material on a support made of a second material, said method comprising:an ionic implantation stage during which a face of a substrate of said first material is bombarded with ions in order to create a layer of micro-cavities in the volume of the substrate and to a depth similar to the penetration depth of the ions, said layer separating the substrate into two areas, the area located between said bombarded face of substrate and the layer of micro-cavities constituting the thin film, a bonding stage in which said bombarded face of substrate is put into close contact with a corresponding face of the support, a final heat treatment stage intended to bring the layer of micro-cavities to a temperature high enough to cause the two areas of the substrate to separate, the method also comprising a thinning stage of at least one of said elements, substrate or support, the thickness of the thinned element being such that the assembly, constituted by the elements bonded together by said close contact, can withstand the heat treatment stage that causes said separation while conserving said close contact despite the stresses to which said elements are subject and that are due to the difference in their thermal dilation coefficients.