Patent ID: 6251711
Filing Date: 2001-06-26
Classification: H01L

Abstract:
A method for forming silicide without bridge phenomena, said method comprising following steps:providing a substrate, wherein at least an isolations is located inside said substrate;forming a pad layer on said substrate;forming a first cap layer on said pad layer;defining a trench region;removing part of said pad layer and part of said first cap layer that are located inside said trench such that a trench is formed;filling said trench by a gate oxide layer and a polysilicon layer in sequence;capping a first metal layer on said polysilicon layer;performing a first rapid thermal process to form a first silicide layer over said gate oxide layer;removing excess said first metal layer that is not reacted in said first rapid thermal process;forming a second cap layer on said first silicide layer;planarizing surface of both said first cap layer and said second cap layer;removing said first cap layer;removing part of said pad layer that is not covered by said gate oxide layer and then a gate structure being formed, wherein said gate structure comprises said gate oxide layer, said first suicide layer and said second cap layer;forming two light doped drains in said substrate, herein said light doped drains are located around said gate structure;forming a spacer on sidewall of said gate structure;forming a source and a drain in said substrate; herein said source and said drain are located around said light doped drains;forming a plurality of second metal layers on both said source and said drain;performing a second thermal process to form two second silicide layers over said source and said drain;removing excess said second metal layer that is not reacted in said second thermal process; andperforming a third rapid thermal process.