Patent ID: 7601634

Claim:
A process, comprising: locally modifying a zone within a conductive substrate region of an integrated circuit so as to create a modified zone that extends as far as at least part of the surface of the conductive substrate region wherein the modified zone is formed from a material that can be removed selectively with respect to the material of the conductive substrate region; covering the conductive substrate region with an insulating material; forming an orifice in the insulating material emerging at the surface of the modified zone; removing the selectively removable material from the modified zone through the orifice so as to form a cavity in place of the modified zone; and filling the cavity and the orifice with at least one electrically conducting material; wherein the conductive substrate region belongs to an active electronic component of the integrated circuit, that active electronic component being a transistor, and the conductive substrate region being a source or drain of that transistor.