Patent ID: 7648893

Claim:
A method for manufacturing a semiconductor-on-insulator substrate for at least one of microelectronics and optoelectronics, comprising the steps of: supplying a substrate comprising a support having one face made of a dielectric material supporting a strained silicon thin layer having a <110> or <111> orientation; forming a first mask on a portion of the strained silicon thin layer; epitaxy of Si 1-x Ge x on a portion of the layer not masked by the first mask; high-temperature oxidating, according to a germanium condensation technique, until a strained germanium layer is obtained, which rests on the face of the support made of a dielectric material, the strained germanium layer then being covered by a silicon oxide layer; eliminating the first mask and of the silicon oxide layer, thereby exposing a semi-conducting thin layer comprising said strained silicon portion and a remaining strained germanium portion; forming a second mask on said semi-conducting thin layer exposed via said step of eliminating, the second mask protecting a region of the remaining strained germanium portion and at least one region of the strained silicon portion, the second mask exposing a remaining strained germanium portion; epitaxial growing germanium on the remaining strained germanium portion, in order to obtain a germanium thick layer; and eliminating the second mask.