Patent ID: 8722499

Claim:
A method for fabricating a field effect device comprising: providing a substrate that is successively provided with a support substrate, an electrically insulating layer with a first dielectric constant, a semiconductor material film, a gate dielectric material, a gate electrode, wherein a source area and a drain area are located in the semiconductor material film and separated by the gate electrode, partially eliminating the electrically insulating layer between the support substrate and the semiconductor film for forming suspended source and drain areas supported by a first mechanical support area arranged along the gate electrode between the semiconductor film and the support substrate, and depositing an electrically insulating material between the source and drain areas and the support substrate for forming first and second regions configured to have a lower dielectric constant than the support area between the support substrate and semiconductor film, wherein the substrate includes an insulating pattern surrounding the semiconductor material film and the electrically insulating layer; and the insulating pattern is at least partially eliminated to provide access to the electrically insulating layer.