Patent ID: 6121684
Filing Date: 2000-09-19
Classification: H01L

Abstract:
A butt contact structure having a protective spacer to protect against shorting between a second conductive layer and the substrate in a isolation hole comprising:a) an unlined isolation region in an isolation area in a substrate; said isolation region defining active areas in said substrate; a first portion of said isolation region having an isolation hole; said isolation hole and said first portion of said isolation region having sidewalls;b) a first conductive line over portions of said isolation region and said active region;c) an inter-poly insulating layer over said first conductive line;d) a butt contact opening through said inter-poly insulating layer exposing said active region and said first portion of said isolation region;e) protective insulative spacers over at least the sidewalls of said isolation hole and the sidewalls of said first portion of said isolation region;f) a second conductive layer over said inter-poly insulating layer, in said butt contact opening contacting said active area, and over said protective insulative spacers whereby said protective spacers prevent said second conductive layer from contacting said substrate in said isolation area.