Patent ID: 6521542
Filing Date: 2003-02-18
Classification: H01L

Abstract:
A method for forming a step in a layer of material, such method comprising:forming the layer over a substrate; forming a cavity in a portion of an upper surface of the layer; filling the formed cavity with a bi-layer antireflective coating and planarization, filler material to provide a substantially planar surface over the substrate; forming an unexposed photoresist layer comprising a silicon methacrylate top layer disposed over the substantially planar surface over the substrate; forming an aperture in the photoresist layer in registration with the formed cavity, such aperture exposing a portion of the filler material; and removing the exposed portion of the filter material and contiguous portion of the layer to form the step in the layer and having a portion substantially perpendicular to the surface of the layer and a portion substantially parallel to the surface of the layer and wherein the portion substantially parallel to the surface of the layer terminates at a sidewall of the cavity.