Semiconductor device having a low thermal budget metal filling and planarization of contacts, vias and trenches
First Claim
1. An electrical contact structure in a multilayer integrated circuit, wherein an aspect ratio of an aperture within which said electrical contact is formed exceeds 1:
- 1, and wherein a width dimension of said aperture is approxinately 0.5μ
or smaller, said electrical contact structure comprising;
an aperture sidewall lining composed of a carrier layer having a surface roughness of less than 40 Å
; and
a conductor deposited over said carrier layer and reflowed to fill said aperture.
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Accused Products
Abstract
The present invention pertains to a carrier layer and a contact enabled by the carrier layer which enables the fabrication of aluminum (including aluminum alloys and other conductive materials having a similar melting point) electrical contacts in multilayer integrated circuit vias, through holes, or trenches having an aspect ratio greater than one. In fact, the structure has been shown to enable such contact fabrication in vias, through holes, and trenches having aspect ratios as high as at least 5:1, and should be capable of filing apertures having aspect ratios up to about 12:1. The carrier layer, in addition to permitting the formation of a conductive contact at high aspect ratio, provides a diffusion barrier which prevents the aluminum from migrating into surrounding substrate material which operates in conjunction with the electrical contact. The carrier layer preferably comprises a layer formed by ionizing the flux of sputter deposition maternal partially reacting the flux with a gas, and depositing the resulting material on a substrate.
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Citations
31 Claims
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1. An electrical contact structure in a multilayer integrated circuit, wherein an aspect ratio of an aperture within which said electrical contact is formed exceeds 1:
- 1, and wherein a width dimension of said aperture is approxinately 0.5μ
or smaller, said electrical contact structure comprising;an aperture sidewall lining composed of a carrier layer having a surface roughness of less than 40 Å
; anda conductor deposited over said carrier layer and reflowed to fill said aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29)
- 1, and wherein a width dimension of said aperture is approxinately 0.5μ
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13. A carrier layer on the surface of an aperture sidewall which enables the fabrication of an electrical contact in said aperture, wherein an aspect ratio of said electrical contact exceeds 1:
- 1 and a feature size of said contact is about 0.5μ
or less, said carrier layer comprising at least one layer of a sputtered deposit, comprising a refractory metal, a first component of which has been ionized, at least in part, prior to deposition thereof on a surface of said sidewall and a second component which is the reaction product of said first component and a gas. - View Dependent Claims (14, 15, 30)
- 1 and a feature size of said contact is about 0.5μ
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16. An electrical contact structure in a multilayered integrated circuit, wherein an aspect ratio of said electrical contact structure exceeds 1:
- 1 and a width dimension of said structure on which said aspect ratio is based is about 0.5μ
or smaller, said electrical contact structure comprising;(a) at least one carrier layer deposited from a sputtered refractory metal compound of which 10% by weight or more has been ionized before deposition on a sidewall of said contact structure; and (b) at least one layer of conductive material applied over a surface of said carrier layer and reflowed to fill said contact. - View Dependent Claims (17)
- 1 and a width dimension of said structure on which said aspect ratio is based is about 0.5μ
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18. An electrical contact structure in a multilayered integrated circuit, wherein an aspect ratio of said electrical contact structure exceeds 1:
- 1, and a width dimension of said structure on which said aspect ratio is based is about 0.5μ
or smaller, said electrical contact structure comprising;a) at least one first layer deposited from a sputtered refractory metal, at least 10% by weight of which is ionized prior to deposition on a sidewall of said contact structure; b) at least one second layer comprising a sputtered refractory metal compound deposited from a refractory metal, at least 10% by weight of which is ionized and is reacted with a gas before deposition upon a surface of said first layer; c) at least one third layer deposited from a sputtered refractory metal, wherein at least 10% by weight of said refractory metal is ionized before deposition upon a surface of said second layer; and d) at least one layer of conductive material applied over a surface of said third layer. - View Dependent Claims (19, 20, 31)
- 1, and a width dimension of said structure on which said aspect ratio is based is about 0.5μ
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21. A basic carrier layer deposited on a sidewall of an electrical contact stricture and having a surface roughness of less than about 40 Å
- , wherein the aspect ratio of the electrical contact structure exceeds 1;
1 and wherein a contact structure width dimension on which said aspect ratio is based is 0.5μ
or smaller, said carrier layer including at least one layer deposited from a sputtered refractory metal, at least about 10% by weight of which is ionized prior to the deposition on said sidewall. - View Dependent Claims (22, 23, 24, 25, 26, 27)
- , wherein the aspect ratio of the electrical contact structure exceeds 1;
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28. A carrier layer on the surface of an aperture sidewall which enables the fabrication of an electrical contact in a multilayer integrated circuit, wherein an aspect ratio of said electrical contact exceeds 1:
- 1 and a feature size of said contact is about 0.5μ
or less, said carrier layer comprising at least one layer which is a deposit of sputtered refractory-metal-comprising material ionized in an amount ranging from greater than about 10% up to 100% by weight prior to deposition.
- 1 and a feature size of said contact is about 0.5μ
Specification