Semiconductor device interconnect structures formed by metal reflow process
First Claim
1. A method to fabricate a semiconductor device, comprising:
- forming a dual damascene opening in an ILD (inter-level dielectric) layer, wherein the dual damascene opening comprises a via opening and a trench opening which is disposed over the via opening;
depositing a layer of diffusion barrier material to cover the ILD layer and to line the via opening and the trench opening with the diffusion barrier material;
depositing a layer of first metallic material on the layer of diffusion barrier material to cover the ILD layer with overburden first metallic material and to line the via opening and the trench opening with a layer of the first metallic material;
performing a reflow process by thermal annealing at a temperature which causes the layer of first metallic material to melt and allow at least a melted portion of the overburden first metallic material on the ILD layer and at least a melted portion of the layer of first metallic material which lines the trench opening to reflow into the via opening and at least partially fill the via opening with the melted first metallic material; and
depositing a layer of second metallic material on the reflowed first metallic material to at least partially fill a remaining portion of the dual damascene opening in the ILD layer,wherein the first metallic material comprises cobalt.
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Accused Products
Abstract
Methods are devices are provided in which interconnection structures are formed using metal reflow techniques. For example, a method to fabricate a semiconductor device includes forming an opening in an ILD (inter-level dielectric) layer. The opening includes a via hole and a trench. A layer of diffusion barrier material is deposited to cover the ILD layer and to line the opening with the diffusion barrier material. A layer of first metallic material is deposited on the layer of diffusion barrier material to cover the ILD layer and to line the opening with the first metallic material. A reflow process is performed to allow the layer of first metallic material to reflow into the opening and at least partially fill the via hole with the first metallic material. A layer of second metallic material is deposited to at least partially fill a remaining portion of the opening in the ILD layer.
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Citations
17 Claims
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1. A method to fabricate a semiconductor device, comprising:
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forming a dual damascene opening in an ILD (inter-level dielectric) layer, wherein the dual damascene opening comprises a via opening and a trench opening which is disposed over the via opening; depositing a layer of diffusion barrier material to cover the ILD layer and to line the via opening and the trench opening with the diffusion barrier material; depositing a layer of first metallic material on the layer of diffusion barrier material to cover the ILD layer with overburden first metallic material and to line the via opening and the trench opening with a layer of the first metallic material; performing a reflow process by thermal annealing at a temperature which causes the layer of first metallic material to melt and allow at least a melted portion of the overburden first metallic material on the ILD layer and at least a melted portion of the layer of first metallic material which lines the trench opening to reflow into the via opening and at least partially fill the via opening with the melted first metallic material; and depositing a layer of second metallic material on the reflowed first metallic material to at least partially fill a remaining portion of the dual damascene opening in the ILD layer, wherein the first metallic material comprises cobalt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device formed by a process comprising:
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forming a dual damascene opening in an ILD (inter-level dielectric) layer, wherein the dual damascene opening comprises a via opening and a trench opening which is disposed over the via opening; depositing a layer of diffusion barrier material to cover the ILD layer and to line the via opening and the trench opening with the diffusion barrier material; depositing a layer of first metallic material on the layer of diffusion barrier material to cover the ILD layer with overburden first metallic material and to line the via opening and the trench opening with a layer of the first metallic material; performing a reflow process by thermal annealing at a temperature which causes the layer of first metallic material to melt and allow at least a melted portion of the overburden first metallic material on the ILD layer and at least a melted portion of the layer of first metallic material which lines the trench opening to reflow into the via opening and at least partially fill the via opening with the melted first metallic material; and depositing a layer of second metallic material on the reflowed first metallic material to at least partially fill a remaining portion of the dual damascene opening in the ILD layer, wherein the first metallic material comprises cobalt. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification