Patent ID: 6559015
Filing Date: 2003-05-06
Classification: H01L,Y10S

Abstract:
A method for fabricating a field effect transistor on an active device area of a semiconductor substrate, the method including the steps of:A. forming a gate dielectric and a gate electrode on a portion of said active device area of said semiconductor substrate; B. forming first spacers on sidewalls of said gate electrode and said gate dielectric; C. implanting a contact dopant into exposed regions of said active device area of said semiconductor substrate to form a drain contact junction and a source contact junction; D. performing a contact laser thermal anneal with a contact laser fluence to activate said contact dopant within said drain and source contact junctions; E. removing said first spacers on said sidewalls of said gate electrode and said gate dielectric; F. implanting an extension dopant into exposed regions of said active device area of said semiconductor substrate to form a drain extension junction and a source extension junction; G. performing an extension laser thermal anneal with an extension laser fluence to activate said extension dopant within said drain and source extension junctions; and H. performing said step D of performing said contact laser thermal anneal as a separate step from said step G of performing said extension laser thermal anneal such that said contact laser fluence used for said contact laser thermal anneal is different from said extension laser fluence used for said extension laser thermal anneal.