Heterogeneous metal line compositions for advanced integrated circuit structure fabrication

Patent metadata

Field	Value
Publication number	US-2021066475-A1
Application number	US-202017080694-A
Country	US
Kind code	A1
Filing date	Oct 26, 2020
Priority date	Nov 30, 2017
Publication date	Mar 4, 2021
Grant date	—

Abstract

Embodiments of the disclosure are in the field of advanced integrated circuit structure fabrication and, in particular, 10 nanometer node and smaller integrated circuit structure fabrication and the resulting structures. In an example, an integrated circuit structure includes a first plurality of conductive interconnect lines in and spaced apart by a first ILD layer, wherein individual ones of the first plurality of conductive interconnect lines comprise a first conductive barrier material along sidewalls and a bottom of a first conductive fill material. A second plurality of conductive interconnect lines is in and spaced apart by a second ILD layer above the first ILD layer, wherein individual ones of the second plurality of conductive interconnect lines comprise a second conductive barrier material along sidewalls and a bottom of a second conductive fill material, wherein the second conductive fill material is different in composition from the first conductive fill material.

First claim

What is claimed is:

1 . An integrated circuit structure, comprising:
a first plurality of conductive interconnect lines in and spaced apart by a first dielectric layer above a substrate, wherein individual ones of the first plurality of conductive interconnect lines are along a first direction, and wherein individual ones of the first plurality of conductive interconnect lines comprise:
a first conductive fill material having sidewalls and a bottom, the first conductive fill material comprising copper;
a first conductive barrier material along the sidewalls and the bottom of the first conductive fill material, the first conductive barrier material in contact with the first dielectric layer and with the first conductive fill material, and the first conductive barrier material having a first composition, and the first conductive barrier material having an upper surface; and
a first conductive cap layer on the first conductive fill material, wherein the first conductive cap layer is not on a portion of the upper surface of the first conductive barrier material, the first conductive cap layer comprising cobalt;
a second plurality of conductive interconnect lines in and spaced apart by a second dielectric layer above the first dielectric layer, wherein individual ones of the second plurality of conductive interconnect lines are along a second direction orthogonal to the first direction, and wherein individual ones of the second plurality of conductive interconnect lines comprise:
a second conductive fill material having sidewalls and a bottom, the second conductive fill material comprising copper;
a second conductive barrier material along the sidewalls and the bottom of the second conductive fill material, the second conductive barrier material in contact with the second dielectric layer and with the second conductive fill material, and the second conductive barrier material having a second composition different than the first composition of the first conductive barrier material, and the second conductive barrier material having an upper surface; and
a second conductive cap layer on the second conductive fill material, wherein the second conductive cap layer is not on a portion of the upper surface of the second conductive barrier material; and
a conductive via coupling one of the first plurality of conductive interconnect lines directly to one of the second plurality of conductive interconnect lines.

2 . The integrated circuit structure of claim 1 , wherein the first conductive cap layer is not on an entirety of the upper surface of the first conductive barrier material.

3 . The integrated circuit structure of claim 1 , wherein the second conductive cap layer is not on an entirety of the upper surface of the second conductive barrier material.

4 . The integrated circuit structure of claim 1 , wherein the first conductive cap layer is not on an entirety of the upper surface of the first conductive barrier material, and wherein the second conductive cap layer is not on an entirety of the upper surface of the second conductive barrier material.

5 . The integrated circuit structure of claim 1 , wherein individual ones of the first plurality of conductive interconnect lines have a first width, and individual ones of the second plurality of conductive interconnect lines have a second width greater than the first width.

6 . The integrated circuit structure of claim 1 , wherein the second conductive cap layer comprises cobalt.

7 . A computing device, comprising:
a board; and a component coupled to the board, the component including an integrated circuit structure, comprising:
a first plurality of conductive interconnect lines in and spaced apart by a first dielectric layer above a substrate, wherein individual ones of the first plurality of conductive interconnect lines are along a first direction, and wherein individual ones of the first plurality of conductive interconnect lines comprise:
a first conductive fill material having sidewalls and a bottom, the first conductive fill material comprising copper;
a first conductive barrier material along the sidewalls and the bottom of the first conductive fill material, the first conductive barrier material in contact with the first dielectric layer and with the first conductive fill material, and the first conductive barrier material having a first composition, and the first conductive barrier material having an upper surface; and
a first conductive cap layer on the first conductive fill material, wherein the first conductive cap layer is not on a portion of the upper surface of the first conductive barrier material, the first conductive cap layer comprising cobalt;

a second plurality of conductive interconnect lines in and spaced apart by a second dielectric layer above the first dielectric layer, wherein individual ones of the second plurality of conductive interconnect lines are along a second direction orthogonal to the first direction, and wherein individual ones of the second plurality of conductive interconnect lines comprise:
a second conductive fill material having sidewalls and a bottom, the second conductive fill material comprising copper;
a second conductive barrier material along the sidewalls and the bottom of the second conductive fill material, the second conductive barrier material in contact with the second dielectric layer and with the second conductive fill material, and the second conductive barrier material having a second composition different than the first composition of the first conductive barrier material, and the second conductive barrier material having an upper surface; and
a second conductive cap layer on the second conductive fill material, wherein the second conductive cap layer is not on a portion of the upper surface of the second conductive barrier material; and

a conductive via coupling one of the first plurality of conductive interconnect lines directly to one of the second plurality of conductive interconnect lines.

8 . The computing device of claim 7 , further comprising:
a memory coupled to the board.

9 . The computing device of claim 7 , further comprising:
a communication chip coupled to the board.

10 . The computing device of claim 7 , further comprising:
a camera coupled to the board.

11 . The computing device of claim 7 , further comprising:
a battery coupled to the board.

12 . The computing device of claim 7 , further comprising:
an antenna coupled to the board.

13 . The computing device of claim 7 , wherein the component is a packaged integrated circuit die.

14 . The computing device of claim 7 , wherein the component is selected from the group consisting of a processor, a communications chip, and a digital signal processor.

15 . The computing device of claim 7 , wherein the computing device is selected from the group consisting of a mobile phone, a laptop, a desk top computer, a server, and a set-top box.

16 . A method of fabricating an integrated circuit structure, the method comprising:
forming a first plurality of conductive interconnect lines in and spaced apart by a first dielectric layer above a substrate, wherein individual ones of the first plurality of conductive interconnect lines are along a first direction, and wherein forming individual ones of the first plurality of conductive interconnect lines comprises:
forming a first conductive barrier material;
forming a first conductive fill material having sidewalls and a bottom, the first conductive fill material comprising copper, wherein the first conductive barrier material is along the s

Assignees

• Intel Corp

Inventors

• Yeoh Andrew W
• Steigerwald Joseph
• Shin Jinhong
• Chikarmane Vinay
• Auth Christopher P

Classifications

• H10W20/4437

  the principal metal being a transition metal · CPC title

• H10W20/0693

  by forming self-aligned vias · CPC title

• H10W72/30

  Die-attach connectors · CPC title

• H10W72/20

  Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps · CPC title

• H10W72/851

  Dispositions of multiple connectors or interconnections · CPC title