Patent ID: 6358782
Filing Date: 2002-03-19
Classification: H01L

Abstract:
A method of fabricating a semiconductor device, comprising the steps of:preparing an SOI substrate in which a surface silicon layer is formed above a support substrate made of silicon with a buried oxidation film therebetween; forming a plurality of independent component regions made of the surface silicon layer by selectively etching the surface silicon layer; forming a plurality of lightly doped P regions or N regions by selectively ion-implanting impurities atoms of which the conduction type is P-type or N-type into the plurality of component regions; diffusing the impurity atoms in each lightly doped P or N region by heat treatment; forming a gate electrode on each lightly doped P or N region with a gate oxidation film therebetween; forming a substrate contact hole on the support substrate by selectively etching the buried oxidation film; forming a drain layer, a source layer and a heavily doped diffusion layer by selectively ion-implanting impurity atoms of which the conduction type is opposite to that of the lightly doped P or N region into both sides of the gate electrode of each lightly doped P or N region, and by ion-implanting impurity atoms of which the conduction type is the same as that of the support substrate into a portion of the support substrate exposed within the substrate contact hole; forming a component contact hole at a position independently corresponding to each drain layer and source layer of each component region by forming an insulating film on the entire top face of the support substrate and thereafter performing photo-etching treatment, and forming a contact hole also at a position corresponding to the substrate contact hole; forming an independent metal electrode for each contact hole by forming a metal electrode layer on the entire top face of the insulating film and in all the contact holes and thereafter performing photo-etching treatment, and simultaneously forming a pad portion extending onto the insulating film at the metal electrode formed in the substrate contact hole.