Patent ID: 6133141
Filing Date: 2000-10-17
Classification: H01L

Abstract:
A method of forming an electrical connection between conductive layers, comprising the steps of:forming a first electrically conductive layer on a substrate;forming a first protective layer which is resistant to a first etchant on the first electrically conductive layer;forming a second protective layer which is resistant to a second etchant different from the first etchant, on the first protective layer;patterning a mask on the second protective layer so that the mask has an opening therein extending opposite the first electrically conductive layer;selectively etching the second protective layer in the opening in the mask using the first etchant, to expose a portion of the first protective layer;selectively etching the exposed portion of the first protective layer using the second etchant, to define a contact hole therein which exposes a portion of an upper surface and sidewalls of the first electrically conductive layer; andforming a second electrically conductive layer in the contact hole, on the exposed portion of the upper surface and sidewalls of the first electrically conductive layer.