Method of fabrication and device for electromagnetic-shielding structures in a damascene-based interconnect scheme
First Claim
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1. A method of forming a shielded interconnect on a substrate covered with a stack, the method comprising the steps of:
- forming an opening in the stack on the substrate, the substrate comprising at least one active device and the stack comprising at least one insulation layer covering the substrate, wherein the opening is formed at a level above the at least one active device;
depositing a first conductive layer over the stack;
depositing a first dielectric layer over the first conductive layer;
depositing a second conductive layer over the first dielectric layer, and polishing the substrate until at least a portion of the stack is exposed.
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Abstract
A shielded interconnect and a method of manufacturing a shielded interconnect implemented in a damascene back-end-of-line technology to form electromagnetically shielded interconnects. The standard metallization of the damascene technology is used as a core layer in a coaxial interconnect line. Prior to filling the via and trench openings in the damascene stack with this standard metallization, conductive and dielectric layers are formed as shield and insulator layers, respectively, of the coaxial interconnect line.
61 Citations
20 Claims
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1. A method of forming a shielded interconnect on a substrate covered with a stack, the method comprising the steps of:
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forming an opening in the stack on the substrate, the substrate comprising at least one active device and the stack comprising at least one insulation layer covering the substrate, wherein the opening is formed at a level above the at least one active device;
depositing a first conductive layer over the stack;
depositing a first dielectric layer over the first conductive layer;
depositing a second conductive layer over the first dielectric layer, and polishing the substrate until at least a portion of the stack is exposed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A shielded interconnect formed on a substrate covered with a stack comprising the shielded interconnect being manufactured by a method comprising the steps of:
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forming an opening in the stack on the substrate, the substrate comprising at least one active device and the stack comprising at least one insulation layer covering the substrate, wherein the opening is formed at a level above the at least one active device;
depositing a first conductive layer over the stack;
depositing a dielectric layer over the first conductive layer;
depositing a second conductive layer over the dielectric layer, and polishing the substrate until at least a portion of the stack is exposed.
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14. A shielded interconnect, comprising:
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a first conductive layer deposited in an opening of a stack comprising at least one insulating layer and formed on a substrate comprising at least one active device, wherein the opening is at a level above the at least one active device;
a dielectric layer deposited over the first conductive layer; and
a second conductive layer deposited over the dielectric layer, wherein at least a portion of the stack is exposed. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification