Patent ID: 8603872
Filing Date: 2013-12-10
Classification: H01L

Abstract:
1. A field effect device comprising: a substrate successively including a support substrate, an electrically insulating layer and a semiconductor film; a gate electrode having side walls covered by lateral spacers; a source electrode and a drain electrode formed in the semiconductor material film, the source and drain electrodes being arranged on each side of the gate electrode and doped by a first doping impurity; a conduction channel formed in the semiconductor film and separating the source and drain electrodes formed in the semiconductor material film, the conduction channel being arranged facing the gate electrode; and a modified diffusion area is arranged in the extension of one of the lateral spacers according to a first direction that is perpendicular to an interface between the one of the lateral spacers and the semiconductor film so as to connect the electrically insulating layer to the associated lateral spacer and to separate the conduction channel and one of the source and drain electrodes, wherein a diffusion barrier element for the first doping impurity is introduced into the modified diffusion area and concentrations of the diffusion barrier element in the conduction channel and in one of the source and drain electrodes are smaller than the concentration of the diffusion barrier element in the modified diffusion area.