Patent ID: 6087233
Filing Date: 2000-07-11
Classification: H01L

Abstract:
A method for forming a trench isolator in a semiconductor substrate, comprising:forming a mask layer on the substrate, the mask layer having an opening through it exposing a portion of the substrate and defining the location of the trench isolator on the substrate;etching the substrate through the opening in the mask layer to form a trench in the semiconductor substrate;depositing an insulating material on the semiconductor substrate to fill the trench with the insulating material and form an insulating layer thereof;planarization-etching the insulating layer until a top surface of the mask layer is exposed;removing the mask layer to expose a step difference between the insulating layer and the substrate; and,forming a protective layer on the semiconductor substrate that prevents etching-away of the insulating material in the trench isolator during subsequent cleaning processes performed on the substrate.