Target for use in magnetron sputtering of aluminum for forming metallization films having low defect densities and methods for manufacturing and using such target

US6001227A · kind A · utility

Assignee

• Applied Materials, Inc. · US

Inventors

• Vikram Pavate · San Mateo, US
• Keith J. Hansen · San Jose, US
• Glen T. Mori · Gilroy, US
• Murali Narasimhan · San Jose, US
• Seshadri Ramaswami · San Jose, US
• Jaim Nulman · Palo Alto, US

Key dates

• Filing date: Nov 26, 1997
• Grant date: Dec 14, 1999
• Expiry date: Nov 26, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49988
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Improved targets for use in DC.sub.-- magnetron sputtering of aluminum or like metals are disclosed for forming metallization films having low defect densities. Methods for manufacturing and using such targets are also disclosed. Conductivity anomalies such as those composed of metal oxide inclusions can induce arcing between the target surface and the plasma. The arcing can lead to production of excessive deposition material in the form of splats or blobs. Reducing the content of conductivity anomalies and strengthening the to-be-deposited material is seen to reduce production of such splats or blobs. Other splat limiting steps include smooth finishing of the target surface and low-stress ramp up of the plasma.