Structures electrically connecting aluminum and copper interconnections and methods of forming the same
First Claim
1. A method of fabricating a structure in a semiconductor device, comprising:
- forming a lower metal interconnection;
forming a lower insulating layer defining a lower contact hole on the lower metal interconnection, the lower insulating layer exposing a portion of a surface of the lower metal interconnection;
forming an upper insulating layer defining an upper contact hole wider than the lower contact hole on the lower metal interconnection, the upper insulating layer fully exposing the lower contact hole and a portion of a top surface of the lower insulating layer, the portion of the top surface of the lower insulating layer being around the lower contact hole, wherein a depth of the lower contact hole is shallower than a depth of the upper contact hole;
forming a contact spacer disposed on sidewalls of the lower contact hole and the upper contact hole, wherein the contact spacer exposes a portion of the lower metal interconnection and covers an entire surface of the portion of the top surface of the lower insulating layer exposed by the upper insulating layer to smooth an inner shape formed by a step difference of the lower contact hole and the upper contact hole;
forming a barrier pattern on the exposed surface of the lower metal interconnection, the contact spacer and a portion of a top surface of the upper insulating layer;
forming a lower contact directly on the barrier pattern, wherein the lower contact fills the lower contact hole;
forming an upper contact directly on the barrier pattern, wherein the upper contact fills the upper contact hole; and
forming an upper metal interconnection directly on the upper contact and the barrier pattern on the portion of the top surface of the upper insulating layer.
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Abstract
A structure and formation method for electrically connecting aluminum and copper interconnections stabilize a semiconductor metallization process using an inner shape electrically connecting the aluminum and copper interconnections. To this end, a copper interconnection is disposed on a semiconductor substrate. An interconnection induction layer and an interconnection insertion layer are sequentially formed on the copper interconnection to have a contact hole exposing the copper interconnection. An upper diameter of the contact hole may be formed to be larger than a lower diameter thereof. A barrier layer and an aluminum interconnection are filled in the contact hole. The aluminum interconnection is formed not to directly contact the copper interconnection through the contact hole.
12 Citations
20 Claims
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1. A method of fabricating a structure in a semiconductor device, comprising:
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forming a lower metal interconnection; forming a lower insulating layer defining a lower contact hole on the lower metal interconnection, the lower insulating layer exposing a portion of a surface of the lower metal interconnection; forming an upper insulating layer defining an upper contact hole wider than the lower contact hole on the lower metal interconnection, the upper insulating layer fully exposing the lower contact hole and a portion of a top surface of the lower insulating layer, the portion of the top surface of the lower insulating layer being around the lower contact hole, wherein a depth of the lower contact hole is shallower than a depth of the upper contact hole; forming a contact spacer disposed on sidewalls of the lower contact hole and the upper contact hole, wherein the contact spacer exposes a portion of the lower metal interconnection and covers an entire surface of the portion of the top surface of the lower insulating layer exposed by the upper insulating layer to smooth an inner shape formed by a step difference of the lower contact hole and the upper contact hole; forming a barrier pattern on the exposed surface of the lower metal interconnection, the contact spacer and a portion of a top surface of the upper insulating layer; forming a lower contact directly on the barrier pattern, wherein the lower contact fills the lower contact hole; forming an upper contact directly on the barrier pattern, wherein the upper contact fills the upper contact hole; and forming an upper metal interconnection directly on the upper contact and the barrier pattern on the portion of the top surface of the upper insulating layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of fabricating a structure on a semiconductor device, comprising:
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forming a lower metal interconnection, forming a lower insulating layer on the lower metal interconnection, forming an upper insulating layer on the lower insulating layer; forming a photoresist pattern having an opening overlapping the lower metal interconnection; forming an upper contact hole and a lower contact hole by patterning the upper insulating layer and the lower insulating layer using the photoresist pattern as a patterning mask, wherein the upper contact hole is defined by the upper insulating layer and the lower contact hole is defined by the lower insulating layer; partially removing a portion of the upper insulating layer in the upper contact hole so that the upper contact hole has a larger width and a deeper depth than that of the lower contact hole; removing the photoresist pattern; forming a contact spacer disposed on sidewalls of the lower and upper contact holes and an entire surface of the lower insulating layer exposed by the upper contact hole to smooth an inner shape formed by a step difference of the lower contact hole and the upper contact hole, wherein the contact spacer exposes a portion of the lower metal interconnection; forming a barrier pattern on the exposed surface of the lower metal interconnection, the contact spacer and a portion of a top surface of the upper insulating layer; forming a lower contact directly on the barrier pattern, wherein the lower contact fills the lower contact hole; forming an upper contact directly on the barrier pattern, wherein the upper contact fills the upper contact hole; and forming an upper metal interconnection directly on the barrier pattern on the portion of the top surface of the upper insulating layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of fabricating a structure on a semiconductor device, comprising:
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forming a copper interconnection; forming a lower insulating layer defining a lower contact hole exposing a portion of the copper interconnection, the lower insulating layer exposing a portion of a surface the copper interconnection; forming an upper insulating layer defining an upper contact hole wider than the lower contact hole on the copper interconnection, the upper insulating layer fully exposing the lower contact hole and a portion of a top surface of the lower insulating layer, the portion of the top surface of the lower insulating layer being around the lower contact hole; forming a barrier layer on the exposed portion of the copper interconnection, sidewalls of the lower and upper contact holes, and a top surface of the upper insulating layer, wherein the barrier layer has a first thickness on the exposed portion of the copper interconnection and a second thickness on the sidewall of the upper insulating layer, the first thickness being thicker than the second thickness, and wherein the barrier layer fills the lower contact hole; forming an aluminum layer filing the lower and upper contact holes on the exposed portion of the copper interconnection and the top surface of the upper insulating layer, wherein the aluminum layer has a first portion in the lower and upper contact holes, a second portion on the first portion and the top surface of the upper insulating layer, wherein the aluminum layer is directly formed on a barrier pattern; and selectively removing and leaving the aluminum layer and the barrier layer on the top surface of the upper insulating layer to form an aluminum interconnection and the barrier pattern, wherein sidewalls of the aluminum interconnection and the barrier pattern are vertically aligned with each other on the top surface of the upper insulating layer. - View Dependent Claims (20)
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Specification