Patent ID: 7479437

Claim:
A method of reducing contact resistance on a device, comprising: exposing sidewalls and a portion of a top surface of a source/drain region of the device; forming a porous silicon layer within a surface of the source/drain region; implanting dopants in the source/drain region; and forming a silicide layer over the source/drain regions; wherein said forming said porous silicon layer within the surface of the source/drain region comprises: forming a layer of p+ doping on said exposed sidewalls and portion of the top surface of the source/drain region; forming a nitride liner over the device, including the source/drain region and said layer of p+ doping; forming a planarized resist over said nitride liner; recessing said planarized resist and etching said nitride liner to expose portions of said source/drain region; and forming said porous silicon layer on said exposed portions of said source drain region.