Patent ID: 6383935
Filing Date: 2002-05-07
Classification: H01L

Abstract:
A process to reduce dishing during chemical mechanical polishing, comprising the steps of:providing a structure that includes a substrate having an upper surface in which there is a depression within which there is a trench array having a depth; depositing a layer of metal on said upper surface, including the trench array, to a thickness that is greater than said trench array depth; by means of a spin-on technique, coating the metal layer with a layer of material that is different from said layer of metal and that has a polishing rate, for chemical mechanical polishing, that differs from that of said metal by no more than about 20%; then subjecting the structure with said metal and said material formed thereon to chemical mechanical polishing whereby an amount of metal and material is removed; and then removing any of the material still remaining wherein the trench array has a trench density that is greater than about 90%.