Patent ID: 6326251
Filing Date: 2001-12-04
Classification: H01L

Abstract:
A method for forming a transistor in an active region of a substrate, the method comprising:forming a gate stack on the active region of the substrate, comprising the steps of:forming an insulative layer;forming a first selective layer on top of the insulative layer;forming a photoresist mask on top of the first selective layer; andremoving portions of the insulative layer and the first selective layer unprotectedby the photoresist mask to form the gate stack, wherein the gate stack defines a channel region;doping the substrate to form source and drain regions adjacent the gate stack, wherein the gate stack protects the channel region from the doping;forming a salicide layer on the top surface of the source and drain regions;isotropically etching the gate stack to reduce the width of the gate stack;forming a second selective layer on the substrate wherein the second selective layer surrounds the gate stack; andreplacing the gate stack with a dielectric gate insulator and a metal gate conductor, wherein the second selective layer protects the source and drain regions during formation of the metal gate conductor.