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Patterning of High Tc Superconductor Films with a Focussed Excimer Laser

Published online by Cambridge University Press:  25 February 2011

J.M. Hagerhorst ,
J.D. Mannhart ,
M.M. Oprysko ,
M.R. Scheuermann  and
C.C. Tsuei
J.M. Hagerhorst
Affiliation:
IBM Research Division Thomas J. Watson Research Center Yorktown Heights, New York 10598
J.D. Mannhart
Affiliation:
IBM Research Division Thomas J. Watson Research Center Yorktown Heights, New York 10598
M.M. Oprysko
Affiliation:
IBM Research Division Thomas J. Watson Research Center Yorktown Heights, New York 10598
M.R. Scheuermann
Affiliation:
IBM Research Division Thomas J. Watson Research Center Yorktown Heights, New York 10598
C.C. Tsuei
Affiliation:
IBM Research Division Thomas J. Watson Research Center Yorktown Heights, New York 10598
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Abstract

Laser ablation using focussed excimner light has been found to be an effective technique for the direct, maskless patterning of High Tc superconductor films. The apparatus used in the work consists of an adjustable aperture which is illuminated by a 193 nm excimer laser beam. The aperture is imaged by a microscope onto the substrate into an area as large as 200 × 200 to an area as small as 2 × 2 square microns. The superconductor films are placed on a 0.5 micron resolution, computer controlled x-y stage. Laser fluences up to 5 J/cm2 and repetition rates of 10 Hz were found to be sufficient to ablate (pattern) the High Tc films with no apparent effect on their superconducting properties as evidenced by the films′ resistance as a function of temperature (R vs T) before and after patterning.

The technique and apparatus are flexible enough to allow patterning across entire substrates and/or the definition of isolated features as small as one micron. To date, the technique has been successfully used to pattern a wide variety of films (based on material and thickness), to fabricate transmission lines several millimeters long, to pattern superconducting quantum interference devices (SQUIDs) which operate at liquid nitrogen temperatures, and to study the behavior of individual grain boundaries within films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 129: Symposium B – Laser and Particle-Beam Modification of Chemical Processes on Surfaces , 1988 , 347
Copyright
Copyright © Materials Research Society 1989

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References

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