Patent ID: 7229867

Claim:
A process for producing a field-effect transistor, comprising: a) obtaining a conducting substrate that supports a portion of a semiconductor material above a surface of the substrate, with a portion of a temporary material between the portion of semiconductor material and the substrate; b) forming a gate, the gate comprising an upper part, in rigid connection with the portion of semiconductor material, and at least one bearing part coupled to the substrate, the gate being formed so as to be electrically isolated from the portion of semiconductor material and from a conducting portion of the substrate; c) removing the temporary material, wherein the gate holds the portion of semiconductor material in place relative to the substrate and an empty space is created between the portion of semiconductor material and the substrate in place of the portion of temporary material; and d) filling the empty space at least partly with an insulating material, wherein the portion of semiconductor material and the portion of temporary material are obtained by etching respective layers of semiconductor material and of temporary material that are superposed on the surface of the substrate, outside a region intended to support the transistor, until reaching the substrate.