Patent ID: 9105666
Filing Date: 2015-08-11
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor structure, the method comprising: forming an etch stop material between a substrate and a stack of alternating insulating materials and first conductive materials, the etch stop material comprising an amorphous aluminum oxide in contact with the substrate and a crystalline aluminum oxide in contact with the amorphous aluminum oxide; forming an opening through the stack of alternating insulating materials and first conductive materials; selectively removing a portion of each of the first conductive materials relative to adjacent alternating insulating materials in the stack to form a plurality of first recesses adjacent each of the first conductive materials; extending a depth of the opening into the crystalline aluminum oxide and the amorphous aluminum oxide to form a second recess in the amorphous aluminum oxide; filling the second recess with an oxide material and a nitride material; and filling the plurality of first recesses with a second conductive material.