Semiconductor interconnect interface processing by high temperature deposition
First Claim
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1. A method of manufacturing a semiconductor device, comprising the steps of:
- providing a semiconductor wafer with a first dielectric layer formed thereon;
forming an opening in said first dielectric layer, said opening defined by walls of said first dielectric layer;
filling said opening with a conductive material;
forming a second dielectric layer on said first dielectric layer;
forming an opening in said second dielectric layer, said opening defined by walls of said second dielectric layer and connected to said conductive material;
forming an adhesion/barrier layer to line said second dielectric layer in said opening and in contact with said conductive material, said forming of said adhesion/barrier layer performed at a high temperature whereby intermixing of said conductive material and said adhesion/barrier layer occurs;
cooling and adhesion/barrier layer to a temperature below a temperature at which seed material agglomerates; and
forming a seed layer of said seed material to line said adhesion/barrier layer at a temperature below said agglomeration temperature.
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Abstract
A method is provided for forming adhesion/barrier/conductor layers on semiconductor wafers in vias by using a high temperature adhesion/barrier material deposition step. The adhesion/barrier material is deposited over a channel conductor in the semiconductor dielectric with the semiconductor wafer at high temperature over 400° C., the temperature is reduced below 150° C., and then seed material is deposited so it is not exposed to temperatures above 150° C. which cause agglomeration.
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Citations
14 Claims
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1. A method of manufacturing a semiconductor device, comprising the steps of:
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providing a semiconductor wafer with a first dielectric layer formed thereon;
forming an opening in said first dielectric layer, said opening defined by walls of said first dielectric layer;
filling said opening with a conductive material;
forming a second dielectric layer on said first dielectric layer;
forming an opening in said second dielectric layer, said opening defined by walls of said second dielectric layer and connected to said conductive material;
forming an adhesion/barrier layer to line said second dielectric layer in said opening and in contact with said conductive material, said forming of said adhesion/barrier layer performed at a high temperature whereby intermixing of said conductive material and said adhesion/barrier layer occurs;
cooling and adhesion/barrier layer to a temperature below a temperature at which seed material agglomerates; and
forming a seed layer of said seed material to line said adhesion/barrier layer at a temperature below said agglomeration temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing a semiconductor device, comprising the steps of:
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providing a semiconductor wafer with a first dielectric layer formed thereon;
forming an opening in said first dielectric layer, said opening defined by walls of said first dielectric layer;
filling said opening with a conductive material selected from a group comprising copper, copper alloys, and a combination thereof;
forming a second dielectric layer on said first dielectric layer;
forming an opening in said second dielectric layer, said opening defined by walls of said second dielectric layer and connected to said conductive material;
heating said semiconductor wafer to above the agglomeration temperature of said conductive material;
deposing an adhesion/barrier layer to line said dielectric layer in said opening and in contact with said conductive material during said heating step whereby intermixing of said conductive material and said adhesion/barrier layer occurs, said adhesion/barrier layer selected from a group comprising tantalum, tantalum alloys, and a combination thereof;
cooling said adhesion/barrier layer to a temperature below a temperature at which seed material agglomerates; and
depositing a seed layer of said seed material to line said adhesion/barrier layer at a temperature below said agglomeration temperature, said seed layer selected from a group comprising copper, copper alloys, and a combination thereof. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification