Patent ID: 6316323
Filing Date: 2001-11-13
Classification: H01L

Abstract:
A method for preventing bridge issue, said method comprising following steps:providing a substrate;forming a pad layer on said substrate;forming a first cap layer on said pad layer;defining a trench region over said substrate, wherein part of said first cap layer that is inside said trench region is removed to form a trench;implanting a plurality of first ions into part of said substrate that is uncovered by said first cap layer;forming a pair of spacers on sidewall of said trench;implanting a plurality of second ions into part of said substrate that is not covered by said first layer of said spacers;forming a gate oxide layer inside said trench;filling a polysilicon layer into said trenchcapping a first metal layer on said polysilicon layer;performing a first rapid thermal process;removing unreacted said first metal layer;filling said trench by a second cap layer, wherein said first cap layer is not covered by said second cap layer;removing said first cap layer and said pad layer that are not located inside said trench region, and then a gate structure is formed;forming a source and a drain inside said substrate, wherein said source and said drain are located around said gate structure;forming a second metal layer on said substrate;performing a second rapid thermal process;removing unreacted said second metal layer;performing a third rapid thermal process;forming a third cap layer on said substrate, wherein said gate structure is covered by said third cap layer; andforming a pair of contacts inside said third cap layer, wherein said contacts are connected to said source and said drain separately.