Patent ID: 6297117
Filing Date: 2001-10-02
Classification: H01L,Y10S

Abstract:
A method for forming halo regions of a field effect transistor having a gate structure on a gate dielectric within an active device area of a semiconductor substrate, the method including the steps of:A. forming a first dummy spacer on a first sidewall of said gate structure and said gate dielectric, wherein said first dummy spacer is disposed substantially over a drain extension junction of said field effect transistor;B. forming a second dummy spacer on a second sidewall of said gate structure and said gate dielectric, wherein said second dummy spacer is disposed substantially over a source extension junction of said field effect transistor;C. depositing an insulating material to cover said first dummy spacer, said second dummy spacer, and said gate structure;D. polishing down said insulating material until top surfaces of said gate structure, said first dummy spacer, and said second dummy spacer are exposed such that said top surfaces of said gate structure, said first dummy spacer, and said second dummy spacer are level with a top surface of said insulating material;E. etching away said first dummy spacer to form a first spacer opening and etching away said second dummy spacer to form a second spacer opening;F. implanting a halo dopant through said first spacer opening to form a drain halo region substantially beneath said drain extension junction within said semiconductor substrate and through said second spacer opening to form a source halo region substantially beneath said source extension junction within said semiconductor substrate; andG. heating up said drain halo region and said source halo region in a thermal anneal process to activate said halo dopant within said drain halo region and said source halo region;wherein said step G includes the step of:applying a laser beam toward said semiconductor substrate such that said laser beam applied through said first spacer opening and said second spacer opening activates said halo dopant within said drain halo region and said source halo region.