Barrier for through-silicon via
First Claim
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1. A method comprising:
- forming on a first surface of a semiconductor substrate an integrated circuit device;
forming over the first surface a dielectric layer;
etching an opening through the dielectric layer and at least partially through the substrate, the opening having sidewalls;
conformally forming a barrier layer on the sidewalls, wherein the barrier layer includes a composition having a metal component and a carbon alloying material at a concentration of no greater than about 15% of the barrier layer; and
forming a conductor on the barrier layer, wherein the conductor completely fills the opening, the conductor having a top surface coplanar with a top surface of the dielectric layer and a bottom surface at a bottom surface of the opening proximate a second surface of the substrate.
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Abstract
A system and a method for protecting vias is disclosed. An embodiment comprises forming an opening in a substrate. A barrier layer disposed in the opening including along the sidewalls of the opening. The barrier layer may include a metal component and an alloying material. A conductive material is formed on the barrier layer and fills the opening. The conductive material to form a via (e.g., TSV).
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Citations
13 Claims
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1. A method comprising:
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forming on a first surface of a semiconductor substrate an integrated circuit device; forming over the first surface a dielectric layer; etching an opening through the dielectric layer and at least partially through the substrate, the opening having sidewalls; conformally forming a barrier layer on the sidewalls, wherein the barrier layer includes a composition having a metal component and a carbon alloying material at a concentration of no greater than about 15% of the barrier layer; and forming a conductor on the barrier layer, wherein the conductor completely fills the opening, the conductor having a top surface coplanar with a top surface of the dielectric layer and a bottom surface at a bottom surface of the opening proximate a second surface of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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forming at least one active device on a first surface of a semiconductor substrate; forming an interlevel dielectric layer (ILD) over the first surface and the at least one active device; forming a contact structure extending through the ILD and electrically contacting the at least one active device; etching an opening extending through the ILD and at least partially through the semiconductor substrate, the opening having sidewalls and a bottom, wherein a portion of the sidewalls in the ILD are substantially aligned with a portion of the sidewalls in the semiconductor substrate; forming a liner on the ILD and on the sidewalls and bottom of the opening;
forming abarrier layer on the liner by depositing barrier material using a precursor composition having a metal component and a carbon alloying material, the carbon alloying material having a concentration of no greater than about 15% of the barrier material; forming an adhesion layer on the barrier layer; forming a seed layer on the adhesion layer and electroplating a conductor on the seed layer and wholly filling the opening; removing portions of a second surface of the semiconductor substrate to expose the conductor; and forming an electrical contact on at least one end of the conductor. - View Dependent Claims (11, 12, 13)
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Specification