Patent ID: 6059984
Filing Date: 2000-05-09
Classification: C04B,G11B,H01L,Y10T

Abstract:
A process for forming a recessed crater in a thin film device comprising:forming an alumina layer over a substrate;forming a mask over said alumina layer, said mask comprising at least one metallic layer and at least one photoresist layer disposed over said at least one metallic layer, said at least one metallic layer comprising a bottom adhesion metallic layer, said mask having formed therethrough at least one opening;etching at least a portion of said alumina layer by solely applying a wet alumina etchant through said at least one opening to form at least one recessed crater in said alumina layer, said at least one metallic layer being substantially immune from etching by said wet alumina etchant;removing said at least one photoresist layer; andfabricating a feature or layer of said thin film device such that at least a portion of said feature or layer is located in said recessed crater.