Semiconductor device manufacturing method including forming a metal silicide layer on an indium-containing layer
View Patent ↗The present invention provides a semiconductor device manufacturing method of a semiconductor device having a contact plug, in which a contact hole formed by a surface portion of a high-concentration N-type diffusion layer formed on a semiconductor silicon substrate surface and an interlayer insulating film is implanted with indium ions at an energy ranging from 30 to 120 keV and an implantation amount ranging from 1.0×10 13 /cm 2 to 5.0×10 14 /cm 2 to grow an indium-containing layer on the surface portion of the high-concentration N-type diffusion layer at the bottom of the contact hole.
1. 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.
2. The semiconductor device manufacturing method according to claim 1 , wherein the metal suicide layer is of at least one selected from the group consisting of TiSi 2 , CoSi 2 , TaSi 2 , PtSi 2 and NiSi 2 .
3. The semiconductor device manufacturing method according to claim 2 , wherein an acceleration energy for implantation of the indium ions ranges from 40 keV to 100 keV.
4. The semiconductor device manufacturing method according to claim 3 , wherein the implantation amount ranges from 4.0×10 13 /cm 2 to 1.0×10 14 /cm 2 .
5. The semiconductor device manufacturing method according to claim 2 , wherein the implantation amount ranges from 4.0×10 13 /cm 2 to 1.0×10 14 /cm 2 .
6. The semiconductor device manufacturing method according to claim 1 , wherein an acceleration energy for implantation of the indium ions ranges from 40 keV to 100 keV.
7. The semiconductor device manufacturing method according to claim 6 , wherein the implantation amount ranges from 4.0×10 13 /cm 2 to 1.0×10 14 /cm 2 .
8. The semiconductor device manufacturing method according to claim 1 , wherein the implantation amount ranges from 4.0×10 13 /cm 2 to 1.0×10 14 /cm 2 .