Patent ID: 6057224
Filing Date: 2000-05-02
Classification: H01L,Y10S

Abstract:
A method for making an integrated circuit structure with air dielectric comprising the steps of:preparing a substrate;forming an air dielectric formation layer over said substrate, said air dielectric formation layer having a bottom surface in contact with said substrate and having a top surface, said air dielectric formation layer including sacrificial material extending between said bottom surface and said top surface and an insulating non-sacrificial material extending between said bottom surface and said top surface;forming a supported layer over said air dielectric formation layer having a bottom surface and a top surface, said bottom surface of said supported layer being in contact with said top surface of said air dielectric formation layer, said supported layer having at least one aperture extending therethrough from its bottom surface to its top surface such that there is at least one path through said supported layer to said substrate through said sacrificial material; andremoving at least some of said sacrificial material through said at least one aperture with an isotropic etchant, thereby creating at least one air dielectric region where said sacrificial material is removed and at least one pillar of said insulating non-sacrificial material below said supported layer, whereby said supported layer is at least partially supported by said at least one pillar;wherein said supported layer includes a patterned metallization layer such that at least one segment of said patterned metallization layer forms a dummy metallization line that defines at least part of said at least one pillar.