Methods of forming MIS contact structures on transistor devices

Patent metadata

Field	Value
Publication number	US-9831123-B2
Application number	US-201615091138-A
Country	US
Kind code	B2
Filing date	Apr 5, 2016
Priority date	Apr 5, 2016
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

One method disclosed herein includes performing a plurality of conformal deposition processes to form first, second and third layers of material within a contact opening, wherein the first layer comprises a contact insulating material, the second layer comprises a metal-containing material and the third layer comprises a conductive cap material, wherein the third layer is positioned above the second layer. The method further includes forming a contact ion implant region that is positioned at least partially in at least one of the first, second or third layers of material, forming a conductive material above the third layer and removing portions of the layers of material positioned outside of the contact opening.

First claim

What is claimed:

1. A method of forming an MIS contact structure on a transistor, comprising:
forming a contact opening in at least one layer of insulating material, said contact opening exposing an upper surface portion of a source/drain (S/D) region of said transistor;
performing a plurality of conformal deposition processes to conformally deposit first, second and third layers of material within said contact opening, wherein performing said plurality of conformal deposition processes comprises:
performing a first conformal deposition process to conformally deposit said first layer within said opening, wherein said first layer comprises a contact insulating material, is positioned on and in direct contact with said exposed upper surface portion of said S/D region, and covers an entirety of sidewall surfaces of said contact opening;
performing a second conformal deposition process to conformally deposit said second layer within said opening, wherein said second layer comprises a metal-containing material and is positioned on said first layer; and
performing a third conformal deposition process to conformally deposit said third layer within said opening, wherein said third layer comprises a conductive cap material and is positioned above said second layer;

performing a contact ion implantation process to form a contact ion implant region comprising a contact ion that is positioned at least partially in at least one of said first, second or third layers of material;
forming a fourth layer of material comprising a conductive material above said third layer such that said fourth layer overfills said contact opening; and
performing at least one process operation to remove portions of said first, second, third and fourth layers of material positioned outside of said contact opening.

2. The method of claim 1 , wherein said third layer is formed on and in contact with said second layer.

3. The method of claim 1 , wherein said first layer comprises one of a high-k insulating material (k value of 10 or greater), zirconium oxide (ZrO 2 ), hafnium oxide (HfO 2 ), hafnium zirconium oxide (HfZrO x ), HfSiO x N y , niobium oxide (Nb x O y ), cerium oxide (CeO 2 ), tantalum oxide (Ta 2 O 5 ), titanium tantalum oxide (TiTa x O y ), strontium titanate (SrTiO 3 ), aluminum oxide (Al 2 O 3 ), nickel oxide (Ni x O y ), titanium oxide (TiO 2 ), lanthanum oxide (La 2 O 3 ) or zinc oxide (ZnO).

4. The method of claim 1 , wherein said second layer comprises an N-type metal-containing layer of material.

5. The method of claim 1 , wherein said second layer comprises a P-type metal-containing layer.

6. The method of claim 1 , wherein said third layer comprises one of titanium nitride, nickel nitride, tungsten nitride or an electrically conductive metal nitride.

7. The method of claim 1 , further comprising, after performing said contact ion implantation process, performing an anneal process at a temperature that falls within a range of about 250-850° C.

8. The method of claim 7 , wherein said anneal process is performed prior to forming said fourth layer.

9. The method of claim 7 , wherein said anneal process is performed after forming said fourth layer.

10. The method of claim 1 , wherein said fourth layer comprises one of copper, tungsten, cobalt, nickel, aluminum or doped polysilicon.

11. The method of claim 1 , wherein performing said contact ion implantation process comprises performing said contact ion implantation process with a dose of said contact ion that falls within a range of about 1×10 14 -1×10 15 ion/cm 2 and at an energy level that falls within a range of about 0.1-10 keV.

12. The method of claim 1 , wherein said transistor device is an N-type transistor device, said S/D region is an N-doped S/D region that is doped with an N-type dopant ion and wherein performing said contact ion implantation process comprises performing said contact ion implantation process with a contact ion that is different than said N-type dopant ion.

13. The method of claim 1 , wherein said transistor device is an N-type transistor device and wherein performing said contact ion implantation process comprises performing said contact ion implantation process with a contact ion comprising one of phosphorous (P), magnesium (Mg) or antimony (Sb).

14. The method of claim 1 , wherein said transistor device is a P-type transistor device, said S/D region is a P-doped S/D region that is doped with a P-type dopant ion and wherein performing said contact ion implantation process comprises performing said contact ion implantation process with a contact ion that is different than said P-type dopant ion.

15. The method of claim 1 , wherein said transistor device is a P-type transistor device and wherein performing said contact ion implantation process comprises performing said contact ion implantation process with a contact ion comprising one of aluminum (Al), nickel (Ni), gallium (Ga) or nitrogen (N).

16. The method of claim 1 , wherein said transistor device is an N-type transistor device, said first layer comprises zirconium oxide, said second layer comprises a P-type metal-containing layer, said third layer comprises titanium nitride and wherein performing said contact ion implantation process comprises performing said contact ion implantation process with a contact ion comprising one of phosphorous (P), magnesium (Mg) or antimony (Sb).

17. The method of claim 1 , wherein said transistor device is a P-type transistor device, said first layer comprises zirconium oxide, said second layer comprises an N-type metal-containing layer of material, said third layer comprises titanium nitride and wherein performing said contact ion implantation process comprises performing said contact ion implantation process with a contact ion comprising one of aluminum (Al), nickel (Ni), gallium (Ga) or nitrogen (N).

18. The method of claim 1 , wherein performing said at least one process operation comprises performing at least one chemical mechanical polishing process operation.

19. A method of forming an MIS contact structure on a transistor, comprising:
forming a contact opening in at least one layer of insulating material, said contact opening exposing an upper surface portion of a source/drain (S/D) region of said transistor that is doped with a source/drain (S/D) dopant ion;
performing a plurality of conformal deposition processes to conformally deposit first, second and third layers of material within said contact opening wherein performing said plurality of conformal deposition processes comprises:
performing a first conformal deposition process to conformally deposit said first layer within said opening, wherein said first layer comprises one of zirconium oxide or hafnium oxide, is positioned on and in direct contact with said exposed upper surface portion of said S/D region, and covers an entirety of sidewall surfaces of said contact opening;
performing a second conformal deposition process to conformally deposit said second layer within said opening, wherein said second layer comprises a metal-containing material and is positioned on and in contact with said first layer; and
performing a third conformal deposition process to conformally deposit said third layer within said opening, wherein said third layer comprises a conductive cap material and is positioned above said second layer;

performing a contact ion implantation process to form a contact ion implant region comprising a contact ion that is positioned at least partially in at least one of said first, second or third layers of material,

Assignees

• Globalfoundries Inc

Inventors

• Patil Suraj K
• Sun Zhiguo
• Tabakman Keith

Classifications

• H10W20/4437

  the principal metal being a transition metal · CPC title

• H10P14/42 Primary

  using a gas or vapour · CPC title

• H10W20/069

  by forming self-aligned vias or self-aligned contact plugs · CPC title

• H10W20/0526

  by thermal treatment thereof · CPC title

• H10W20/076

  in via holes or trenches · CPC title