Cost-effective TSV formation
First Claim
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1. A device comprising:
- a substrate comprising a first surface, and a second surface opposite the first surface;
a through-substrate via (TSV) extending from the first surface to the second surface of the substrate, wherein the TSV is formed of a continuous metallic material;
a dielectric liner between the TSV and the substrate, wherein the dielectric liner extends over the first surface of the substrate;
a dielectric layer over the substrate, wherein the dielectric layer is on a top surface of the dielectric liner; and
a first metal pad in the dielectric layer and physically contacting the TSV, wherein the first metal pad is formed of the continuous metallic material, wherein a top surface of the first metal pad is substantially coplanar with a top surface of the dielectric layer.
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Abstract
A device includes a substrate having a first surface, and a second surface opposite the first surface. A through-substrate via (TSV) extends from the first surface to the second surface of the substrate. A dielectric layer is disposed over the substrate. A metal pad is disposed in the dielectric layer and physically contacting the TSV, wherein the metal pad and the TSV are formed of a same material, and wherein no layer formed of a material different from the same material is between and spacing the TSV and the metal pad apart from each other.
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Citations
19 Claims
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1. A device comprising:
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a substrate comprising a first surface, and a second surface opposite the first surface; a through-substrate via (TSV) extending from the first surface to the second surface of the substrate, wherein the TSV is formed of a continuous metallic material; a dielectric liner between the TSV and the substrate, wherein the dielectric liner extends over the first surface of the substrate; a dielectric layer over the substrate, wherein the dielectric layer is on a top surface of the dielectric liner; and a first metal pad in the dielectric layer and physically contacting the TSV, wherein the first metal pad is formed of the continuous metallic material, wherein a top surface of the first metal pad is substantially coplanar with a top surface of the dielectric layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device comprising:
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a substrate comprising a top surface, and a bottom surface opposite the top surface; a through-substrate via (TSV) extending from the top surface of the substrate into the substrate; an isolation layer over the top surface of the substrate; a dielectric layer over the isolation layer; a metal pad in the dielectric layer and contacting the TSV, wherein the metal pad and the TSV are formed of a same material, and have different horizontal dimensions; a conductive diffusion barrier extending from a top surface of the dielectric layer to a bottom surface of the TSV, wherein the conductive diffusion barrier encircles the metal pad and the TSV; and a dielectric liner between the conductive diffusion barrier and the substrate, wherein the isolation layer is on a top surface of the dielectric liner. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A device comprising:
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a semiconductor substrate comprising a top surface, and a bottom surface opposite the top surface; a through-substrate via (TSV) extending from the top surface to the bottom surface of substrate; a first dielectric layer over the semiconductor substrate; a second dielectric layer over the first dielectric layer; a first metal pad in the second dielectric layer and electrically coupled to the TSV, wherein the first metal pad and the TSV are formed of a same copper-containing material, and wherein the first metal pad has a horizontal dimension greater than a horizontal dimension of the TSV; a diffusion barrier comprising a first sidewall portion on a sidewall of the first metal pad, and a second sidewall portion on a sidewall of the TSV; and a dielectric liner between the diffusion barrier and the semiconductor substrate, wherein the first dielectric layer is on a top surface of the dielectric liner. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification