Patent ID: 7625811

Claim:
Method for producing first and second active zones on a front face of a support, which said zones are respectively formed by first and second monocrystalline semi-conducting materials that are distinct from one another and comprise coplanar front faces, wherein the support is formed by stacking of a substrate and of an electrically insulating thin layer, a front face of the electrically insulating thin layer constituting the front face of the support and wherein the method comprises at least the following successive steps: formation, on the front face of the electrically insulating thin layer, of the first active zones, at least side walls whereof are covered by a thin protective layer, patterning of the thin protective layer so as to expose interface regions in the side walls of preselected first active zones, insertion between the first active zones, on the front face of the electrically insulating thin layer, of patterns made of second semi-conducting material in polycrystalline and/or amorphous form, each pattern comprising at least a part of a side wall in direct contact with an interface region of an adjacent preselected first active zone and a front face disposed in the same plane as the front faces of the first active zones, deposition of a passivation layer on the first active zones and the patterns, and crystallization of the second semi-conducting material in monocrystalline form so as to form the second active zones.