Method for filling a contact hole and integrated circuit arrangement with contact hole
First Claim
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1. A method for filling a contact hole, comprising:
- depositing a base layer in at least one contact hole under a protective gas atmosphere,wherein the base layer comprises titanium nitride;
depositing a covering layer under gaseous nitrogen atmosphere in the contact hole after depositing the base layerwherein the covering layer comprises titanium nitride, andwherein depositing the base layer under a protective gas substantially prevents the formation of nitride compounds in the titanium nitride at the bottom of the contact hole by reaction with nitrogen contained in the gaseous nitrogen; and
depositing a contact hole filling material comprising tungsten in the contact hole after depositing the covering layer,wherein the covering layer at the bottom of the contact hole, has a thickness of less than about 10 nm.
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Abstract
A method in which a base layer is deposited in a contact hole region under a protective gas, where base layer contains a nitride as main constituent. After the deposition of the base layer, a covering layer is deposited under gaseous nitrogen. An adhesion promoting layer results which is simple to produce and has good electrical properties.
7 Citations
14 Claims
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1. A method for filling a contact hole, comprising:
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depositing a base layer in at least one contact hole under a protective gas atmosphere, wherein the base layer comprises titanium nitride; depositing a covering layer under gaseous nitrogen atmosphere in the contact hole after depositing the base layer wherein the covering layer comprises titanium nitride, and wherein depositing the base layer under a protective gas substantially prevents the formation of nitride compounds in the titanium nitride at the bottom of the contact hole by reaction with nitrogen contained in the gaseous nitrogen; and depositing a contact hole filling material comprising tungsten in the contact hole after depositing the covering layer, wherein the covering layer at the bottom of the contact hole, has a thickness of less than about 10 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An integrated comprising:
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at least one contact hole, in which a base layer and a covering layer comprising titanium nitride are arranged, wherein the base layer adjoins a connecting section comprising one of substantially nitride-free aluminium or an aluminium alloy arranged between the connecting section and the base layer, and wherein the contact hole contains a filling material comprising tungsten, and wherein the covering layer at a bottom of the contact hole has a thickness of less than about 10 nm. - View Dependent Claims (13, 14)
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Specification