Conductive interconnect structures and formation methods using supercritical fluids
First Claim
1. A microfeature workpiece device, comprising:
- a substrate having a first side and a second side opposite from the first side;
a first dielectric material at least partially covering the first side of the substrate;
a second dielectric material at least partially covering the first dielectric material;
a tapered via bounded by wall portions of the substrate and extending through the substrate, the first dielectric material and the second dielectric material, a first end of the tapered via having a first diameter and being proximate to the first side of the substrate, a second end of the tapered via having a second diameter smaller than the first diameter and terminating at the second side of the substrate, the wall portions of the via being spaced apart by a width of the via, the via further having—
a third dielectric material being generally conformal to and in contact with the wall portions of the substrate, the third dielectric material and the second dielectric material being different,a barrier material being generally conformal to and in contact with the third dielectric material,a first conductive material being generally conformal to and in contact with the barrier material, anda second conductive material being generally conformal to and in contact with the first conductive material;
a conductive fill material disposed in the via in contact with the second conductive material, the conductive fill material having a generally uniform grain structure within the via,wherein the third dielectric material, the barrier material, the first conductive material, and the second conductive material terminate at the second side of the substrate, wherein the first dielectric material contacts the third dielectric material, and wherein the second dielectric material contacts the barrier material.
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Accused Products
Abstract
Conductive interconnect structures and formation methods using supercritical fluids are disclosed. A method in accordance with one embodiment of the invention includes forming a via in a substrate, with the via having a width and a length generally transverse to the width, and with a length being approximately 100 microns or more. The method can further include disposing a conductive material in the via while the via is exposed to a supercritical fluid. For example, copper can be disposed in the via by introducing a copper-containing precursor into the supercritical fluid and precipitating the copper from the supercritical fluid. Interconnect structures can be formed using this technique in a single generally continuous process, and can produce conductive structures having a generally uniform grain structure across the width of the via.
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Citations
17 Claims
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1. A microfeature workpiece device, comprising:
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a substrate having a first side and a second side opposite from the first side; a first dielectric material at least partially covering the first side of the substrate; a second dielectric material at least partially covering the first dielectric material; a tapered via bounded by wall portions of the substrate and extending through the substrate, the first dielectric material and the second dielectric material, a first end of the tapered via having a first diameter and being proximate to the first side of the substrate, a second end of the tapered via having a second diameter smaller than the first diameter and terminating at the second side of the substrate, the wall portions of the via being spaced apart by a width of the via, the via further having— a third dielectric material being generally conformal to and in contact with the wall portions of the substrate, the third dielectric material and the second dielectric material being different, a barrier material being generally conformal to and in contact with the third dielectric material, a first conductive material being generally conformal to and in contact with the barrier material, and a second conductive material being generally conformal to and in contact with the first conductive material; a conductive fill material disposed in the via in contact with the second conductive material, the conductive fill material having a generally uniform grain structure within the via, wherein the third dielectric material, the barrier material, the first conductive material, and the second conductive material terminate at the second side of the substrate, wherein the first dielectric material contacts the third dielectric material, and wherein the second dielectric material contacts the barrier material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A microfeature workpiece device, comprising:
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a substrate having a first side and a second side opposite from the first side; a first dielectric material at least partially covering the first side of the substrate; a second dielectric material having a first face at least partially covering the first dielectric material and a second face opposite from the first face; a tapered via bounded by wall portions of the substrate and extending through the substrate, the first dielectric material and the second dielectric material, a first end of the tapered via having a first diameter and being proximate to the first side of the substrate, a second end of the tapered via having a second diameter smaller than the first diameter and terminating at the second side of the substrate, the wall portions of the via being spaced apart by a width of the via, the via further having— a third dielectric material being generally conformal to and in contact with the wall portions of the substrate, a barrier material being generally conformal to and in contact with the third dielectric material, a first conductive material being generally conformal to and in contact with the barrier material, and a second conductive material being generally conformal to and in contact with the first conductive material; a conductive fill material disposed in the via in contact with the second conductive material, the conductive fill material having a generally uniform grain structure within the via, wherein the third dielectric material, the barrier material, the first conductive material, and the second conductive material terminate at the second side of the substrate, wherein the barrier material, the first conductive material, and the second conductive material terminate at the second face of the second dielectric material, wherein the first dielectric material contacts the third dielectric material, and wherein the second dielectric material contacts the barrier material.
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Specification