Use of cobalt tungsten phosphide as a barrier material for copper metallization
First Claim
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1. A method of electrolessly depositing copper onto a barrier layer which separates said copper from another layer disposed on an opposite side of said barrier layer from said copper, comprising the steps of:
- depositing cobalt-tungsten-phosphide, CoWP, electrolessly on an exposed surface of said another layer to form said barrier layer;
depositing said copper electrolessly.
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Abstract
A technique for electrolessly depositing a CoWP barrier material on to copper and electrolessly depositing copper onto a CoWP barrier material to prevent copper diffusion when forming layers and/or structures on a semiconductor wafer.
780 Citations
21 Claims
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1. A method of electrolessly depositing copper onto a barrier layer which separates said copper from another layer disposed on an opposite side of said barrier layer from said copper, comprising the steps of:
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depositing cobalt-tungsten-phosphide, CoWP, electrolessly on an exposed surface of said another layer to form said barrier layer; depositing said copper electrolessly. - View Dependent Claims (2, 3, 4, 5)
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6. A method of electrolessly depositing a barrier layer on copper, comprising the steps of:
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depositing said copper to form a copper layer; depositing cobalt-tungsten-phosphide, CoWP, electrolessly on an exposed surface of said copper layer to form said barrier layer. - View Dependent Claims (7, 8, 9, 10)
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11. A method of electrolessly depositing a diffusion barrier layer on a material layer, comprising the steps of:
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activating a surface of said material layer for autocatalytic growth of cobalt-tungsten-phosphide, (CoWP), by forming an activation seed layer for CoWP on said surface of said material layer; depositing CoWP electrolessly on said surface of said material layer to form said diffusion barrier layer. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of electrolessly depositing a diffusion barrier layer on a conductive layer formed on a semiconductor wafer in order to prevent diffusion of atoms between said conductive layer and a subsequent layer deposited onto said diffusion barrier layer, comprising the steps of:
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depositing cobalt-tungsten-phosphide, CoWP, electrolessly on said conductive layer to form said diffusion barrier layer; depositing said subsequent layer over said diffusion barrier layer. - View Dependent Claims (18, 19, 20, 21)
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Specification