Semiconductor device and manufacturing method thereof
In a method for manufacturing a semiconductor device, a dielectric layer is formed over a substrate. A first pattern and a second pattern are formed in the first interlayer dielectric layer. The first pattern has a width greater than a width of the second pattern. A first metal layer is formed in the first pattern and the second pattern. A second metal layer is formed in the first pattern. A planarization operation is performed on the first and second metal layers so that a first metal wiring by the first pattern and a second metal wiring by the second pattern are formed. A metal material of the first metal layer is different from a metal material of the second metal layer. The first metal wiring includes the first and second metal layers and the second metal wiring includes the first metal layer but does not include the second metal layer.
1. A method for manufacturing a semiconductor device, comprising:
forming a dielectric layer over a substrate, a first conductive pattern and a second conductive pattern being formed in the dielectric layer;
forming a first pattern and a second pattern in the dielectric layer to exposed a part of the first conductive layer and the second conductive layer, the first pattern having a width greater than 60 nm, and greater than a width of the second pattern, which is in a range from about 5 nm to 30 nm;
forming a first metallic layer in the first pattern and the second pattern;
forming a second metallic layer in the first pattern;
performing an annealing operation after the second metallic layer is formed; and
after the annealing operation, performing a planarization operation on the first and second metallic layers so that a first metal wiring by the first pattern and a second metal wiring by the second pattern are formed, wherein:
a metal material of the first metallic layer is different from a metal material of the second metallic layer,
the first metal wiring includes the first and second metallic layers and the second metal wiring includes the first metallic layer but does not include the second metallic layer,
a seam is formed by the first metallic layer in the second pattern and no seam is formed by the first metallic layer in the first pattern after the first metallic layer is formed,
the seam is removed by the annealing operation performed after the second metallic layer is formed and before the planarization operation is performed, and
the planarization operation includes:
a first planarization operation, in which an etching rate for the second metallic layer is higher than an etching rate for the first metallic layer during etching of the second metallic layer; and
a second planarization operation performed after the first planarization operation, in which the etching rate for the second metallic layer is smaller than the etching rate for the first metallic layer during etching of the second metallic layer, and
a dishing amount of the second metallic layer at the first pattern after the first planarization operation is in a range from 10 nm to 20 nm, and no dishing is shown at the second pattern.
2. The method of claim 1 , wherein an additional annealing operation is performed before the second metallic layer is formed.
3. The method of claim 1 , wherein the annealing operation is performed for 1 minute to 10 minutes in an inert gas.
4. The method of claim 1 , wherein the annealing is performed at a temperature from 200° C. to 500° C.
5. The method of claim 1 , wherein the metal material of the first metallic layer includes Ru.
6. The method of claim 1 , wherein:
the metal material of the first metallic layer consists of one of Co, Ru or Ag, and
the metal material of the second metallic layer includes Cu.
7. A method for manufacturing a semiconductor device, comprising:
forming a dielectric layer over a substrate;
forming a first pattern and a second pattern in the dielectric layer, the first pattern having a width greater than a width of the second pattern;
forming a first metallic layer in the first pattern and the second pattern;
forming a second metallic layer in the first pattern and the second pattern;
forming a third metallic layer in the first pattern; and
performing a planarization operation on the first and second metallic layers so that a first metal wiring by the first pattern and a second metal wiring by the second pattern are formed, wherein:
the first metal wiring includes the first and second metallic layers and the second metal wiring includes the first metallic layer but does not include the second metallic layer,
the planarization operation includes:
a first planarization operation of etching the third metallic layer, which stops before reaching the second metallic layer, wherein a remaining thickness of the third metallic layer in in a range from 80 nm to 120 nm;
a second planarization operation of etching the second and third metallic layer, which stops at the first metallic layer; and
a third planarization operation performed after the first planarization operation, by which parts of the dielectric layer and the first to third metallic layers are removed, and
an etching rate of the third metallic layer in the first planarization operation is greater than an etching rate of the third metallic layer in the second planarization operation, and
in the second planarization operation, after the second layer is exposed, the etching rate of the third metallic layer in the second planarization operation is smaller than an etching rate of the second metallic layer in the second planarization operation.
8. The method of claim 7 , wherein:
the first metallic layer of the second metal wiring has a U-shape, and
the second metallic layer fills a remaining part of the second pattern.
9. The method of claim 8 , wherein:
the first and second metallic layers of the first metal wiring have a U-shape, respectively, and
the third metallic layer fills a remaining part of the first pattern.
10. The method of claim 7 , wherein planarization conditions of the second and third planarization operations are different from each other at least in one selected from the group consisting of a type of polishing particles, a pH value, a type of surfactant, a type of corrosion inhibitor and a type of chelator or enhancer.
11. The method of claim 10 , wherein:
in the second planarization operation, an etching rate for the third metallic layer is higher than an etching rate for the second metallic layer; and
in the third planarization operation, the etching rate for the third metallic layer is smaller than the etching rate for the second metallic layer.
12. The method of claim 10 , wherein the metal material of the second metallic layer is made of Co or Ru.
13. The method of claim 10 , wherein:
the metal material of the second metallic layer is made of Co, and
the metal material of the third metallic layer is made of Cu.
14. The method of claim 13 , wherein the first metallic layer includes TiN or TaN.
15. The method of claim 7 , wherein:
a dishing amount at the center of the first pattern measured from an upper surface of the first metallic layer after the second planarization operation is in a range from about 10 nm to about 20 nm.
16. A method for manufacturing a semiconductor device, comprising:
forming a dielectric layer over a substrate;
forming a first pattern and a second pattern in the dielectric layer, the first pattern having a width greater than a width of the second pattern;
forming a first conductive layer in the first and second pattern by chemical vapor deposition;
forming a second conductive layer in the first pattern;
performing a planarization operation on the first and second conductive layers so that an upper surface of the dielectric layer is exposed, wherein:
a conductive material of the first conductive layer is different from a conductive material of the second conductive layer,
a seam is formed by the first conductive layer in the second pattern and no seam is formed by the first conductive layer in the first pattern after the first conductive layer is formed,
the seam is removed by performing an annealing operation,
after the planarization operation, the first conductive layer is continuous between the first pattern and the second pattern, and
the planarization operation includes:
a first planarization operation, in which an etching rate for the second conductive layer is higher than an etching rate for the first conductive layer during etching of the second conductive layer;
a second planarization operation performed after the first planarization operation, in which the etching rate for the second conductive layer is smaller than the etching rate for the first conductive layer during etching of the second conductive layer; and
a third planarization operation performed after the first planarization operation, in which the etching rates for the second conductive layer and the first conductive layer are the same.
17. The method of claim 16 , wherein the annealing operation is performed before the second metallic layer is formed.
18. The method of claim 16 , wherein the annealing operation is performed after the second metallic layer is formed.
19. The method of claim 16 , wherein the annealing is performed at a temperature from 200° C. to 500° C.
20. The method of claim 16 , wherein:
the conductive material of the first conductive layer includes TiN or TaN, and
the conductive material of the second conductive layer includes Co.