Patent ID: 6097076
Filing Date: 2000-08-01
Classification: H01L

Abstract:
An isolation trench structure comprising:a semiconductor substrate having a top surface with an oxide layer thereon;a polysilicon layer upon said oxide layer;a first layer upon said polysilicon layer;a plurality of isolation trenches having electrically insulative material extending continuously between and within said plurality of isolation trenches, each said isolation trench:having a spacer substantially composed of a dielectric material upon said oxide layer in contact with said first layer and said polysilicon layer;extending from an opening thereto at the top surface of said semiconductor substrate and below said oxide layer into and terminating within said semiconductor substrate adjacent to and below said spacer;having a second layer filling said isolation trench and extending above said oxide layer in contact with said spacer; andhaving an upper surface formed from said second layer and said spacer and being situated above said oxide layer.