Patent ID: 6727138
Filing Date: 2004-04-27
Classification: H01L

Abstract:
A process for fabricating an electronic component, incorporating an inductive microcomponent having turns placed on top of a substrate and connected to the substrate via at least one metal pad, which comprises the following steps, consisting successively in:a) depositing a layer of material having a low relative permittivity on the substrate; b) depositing a layer forming a hard mask; c) forming an aperture in the hard mask vertically above the metal pad; d) etching the layer of material having a low relative permittivity down to the metal pad, in order to form an interconnection hole or via; e) depositing a layer forming a copper-diffusion barrier; f) depositing a copper primer layer; g) depositing a protective mask and removing the protective mask from the bottom of the via; h) depositing copper, electrolytically, in the via; i) removing the rest of the protective mask; j) depositing a top resist layer with a thickness similar to the thickness of the turns of the inductive microcomponent; k) etching the resist layer in order to form channels defining the geometry of the turns of the inductive microcomponent; l) depositing copper electrolytically in the channels thus etched to form copper turns; m) removing the rest of the top resist layer; n) etching the copper primer layer between the copper turns; and o) etching the copper-diffusion barrier layer between the turns of the inductive microcomponent.