Patent ID: 7399701

Claim:
A semiconductor device manufacturing method comprising the steps of: (1) forming a high-concentration N-type diffusion layer on a surface of a semiconductor silicon substrate; (2) forming an interlayer insulating film on the semiconductor silicon substrate with the high-concentration N-type diffusion layer; (3) etching a predetermined position of the interlayer insulating film to form a contact hole reaching the high-concentration N-type diffusion layer; (4) implanting a surface portion of the high-concentration N-type diffusion layer with indium ions at an energy ranging from 30 keV to 120 keV and an implantation amount ranging from 1.0×10 13 /cm 2 to 5.0×10 14 /cm 2 via the contact hole to grow an indium-containing layer at a bottom of the contact hole; (5) annealing the semiconductor substrate after implanting the indium ions; (6) depositing a metal by a chemical vapor deposition process at a temperature sufficient to expedite a reaction between the metal and the silicon substrate to form a metal silicide layer on the indium-containing layer formed at the bottom of the contact hole; 7 forming a barrier layer on an upper surface of the interlayer insulating film and an inner surface of the contact hole; and 8 forming a contact plug in the contact hole.