Patent ID: 6584807
Filing Date: 2003-07-01
Classification: G02B,H01L

Abstract:
In a method for fabricating a component on a crystalline silicon substrate and for giving a quality to said component, said method comprising the steps of:depositing a doped silica layer onto a silicon substrate having a crystal lattice, said doped silica layer being doped with dopants and constituting a bottom confinement layer, said crystal lattice having a quality depending on disruptions therein; eliminating said doped silica layer over a region to be treated of said substrate; and treating said silicon substrate in said region to be treated so that said quality of said component depends on said quality of said crystal lattice in said region to be treated, the improvement comprising the additional steps of: before said step of depositing said doped silica layer, forming, between said silicon substrate and said doped silica layer, a barrier layer of a barrier material opposing diffusion of said dopants, said barrier material having a lower rate of diffusion of said dopants than silicon; and after said step of eliminating said doped silica layer and before said step of treating said substrate, eliminating said barrier layer over said region to be treated.