TSV formation
First Claim
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1. A device comprising:
- a substrate having a front side and a backside, the backside being opposite the front side;
an isolation layer on the front side of the substrate, wherein a first portion of the isolation layer and a first portion of the substrate are in physical contact;
a through substrate via (TSV) extending from the front side to the backside of the substrate;
an oxide liner extending along a sidewall of the TSV, wherein the oxide liner further extends between a second portion of the isolation layer and a second portion of the substrate, and wherein a top surface of the second portion of the isolation layer is non-planar;
a dielectric layer over the isolation layer; and
a metal pad in the dielectric layer over the TSV, wherein the metal pad and the TSV are formed of a same material.
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Abstract
A device includes a substrate having a front side and a backside, the backside being opposite the front side. An isolation layer is disposed on the front side of the substrate, wherein first portions of isolation layer and the substrate are in physical contact. A through substrate via (TSV) extends from the front side to the backside of the substrate. An oxide liner is on a sidewall of the TSV. The oxide liner extends between second portions of the substrate and the isolation layer. A dielectric layer having a metal pad is disposed over the isolation layer on the front side of the substrate. The metal pad and the TSV are formed of a same material.
62 Citations
19 Claims
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1. A device comprising:
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a substrate having a front side and a backside, the backside being opposite the front side; an isolation layer on the front side of the substrate, wherein a first portion of the isolation layer and a first portion of the substrate are in physical contact; a through substrate via (TSV) extending from the front side to the backside of the substrate; an oxide liner extending along a sidewall of the TSV, wherein the oxide liner further extends between a second portion of the isolation layer and a second portion of the substrate, and wherein a top surface of the second portion of the isolation layer is non-planar; a dielectric layer over the isolation layer; and a metal pad in the dielectric layer over the TSV, wherein the metal pad and the TSV are formed of a same material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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a semiconductor substrate; an isolation layer over the semiconductor substrate, wherein a surface of the isolation layer contacts a surface of the semiconductor substrate; a through substrate via (TSV) extending through the semiconductor substrate and the isolation layer; an oxide liner disposed between sidewalls of the TSV and the semiconductor substrate, wherein the oxide liner extends partially between the surface of the isolation layer and the surface of the semiconductor substrate; a dielectric layer over the isolation layer; a metal pad in the dielectric layer and connected to the TSV; and a metal line in the dielectric layer, wherein bottom surfaces of the metal pad and the metal line are substantially level. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A device comprising:
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a semiconductor substrate; an isolation layer disposed on a top surface of the semiconductor substrate; a dielectric layer over the isolation layer; a conductive feature extending continuously from a bottom surface of the semiconductor substrate to a top surface if the dielectric layer, wherein a first portion of the conductive feature in the semiconductor substrate is narrower than a second portion of the conductive feature in the dielectric layer, and wherein the conductive feature has a substantially same material composition along a line extending through the conductive feature and perpendicular to the top surface of the semiconductor substrate; a first diffusion barrier layer on sidewalls of the conductive feature; a metal line in the dielectric layer, wherein bottom surfaces of the metal line and the second portion of the conductive feature are substantially leveled; a second diffusion barrier layer on sidewalls and a bottom surface of the metal line, wherein the first diffusion barrier layer and the second diffusion barrier layer comprise a same material; and an oxide liner disposed between the first diffusion barrier layer and the semiconductor substrate, wherein the oxide liner further extends partially between a bottom surface of the isolation layer and the top surface of the semiconductor substrate. - View Dependent Claims (17, 18, 19)
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Specification