Patent ID: 6500350
Filing Date: 2002-12-31
Classification: C23C,H01C,H01L,H05K

Abstract:
A method of forming a patterned layer of resistive material in electrical contact with a layer of electrically conducting material comprising,providing a three-layer structure comprising a metal conductive layer, an intermediate layer formed of material which is degradable by a chemical etchant, and a layer of resistive material of sufficient porosity such that said chemical etchant for said intermediate layer may seep through said resistive material and chemically degrade said intermediate layer so that said resistive material may be ablated from said conductive layer wherever said intermediate layer is chemically degraded, forming a patterned photoresist layer on said resistive material layer, exposing said resistive material layer to said chemical etchant for said intermediate layer so that said etchant seeps through said porous resistive material layer and degrades said intermediate layer, and ablating away portions of said resistive material layer wherever said intermediate layer is degraded.