Computer-Controlled Ion Beam Sputter-Deposition of Superconducting Oxide Films
Abstract
The goals of this project are: 1) the development of a new method for the fabrication of superconducting oxide thin films, viz computer controlled ion beam sputter deposition; and 2) the fabrication of YBa2Cu3O(7-delta) thin films and devices using this method. In the early stage of the project it was demonstrated that the use of complex multicomponent sputter targets (such as ceramic YBa2Cu3O7-delta) present significant problems for compositional control. The new computer-controlled ion beam sputter deposition system was developed. The key features include: 1) a rotatable target holder assembly, which serves to position elemental targets under the ion beam in a rapid sequence, 2) a primary ion beam to produce a sputtered flux from the targets, 3) a secondary oxygen beam (ionic, atomic, or reactive oxygen (ozone)) to oxygenate the film and lower the required deposition temperature, 4) complete computer interfacing to provide real time feedback on the thickness of the depositing species and control of the above items. In terms of the superconductor device objectives, the system is designed to allow for low temperature deposition for integrated devices, compositional control and flexibility, and for scaling to a commercial system. The capability of the system for controlled sequential deposition of layered structures is fundamental for the production of heterostructures and sandwich junctions (superconductor-insulator-superconductor and superconductor-normal-superconductor). This is demanding due to the short coherence lengths in the oxide superconductors.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1989
- Accession Number
- ADA213921
Entities
People
- Angus I. Kingon
- Orlando H. Auciello
- Robert F Davis
Organizations
- North Carolina State University