Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-06-20
1990-04-10
Morgenstern, Norman
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
427 431, 427 531, 427 62, 427 63, 4271263, 427226, B05D 306, B05D 512
Patent
active
049161156
ABSTRACT:
Fine line superconductors of yttrium-barium-copper were formed on <100> strontium titanate substrates by the completely non-vacuum techniques of metallo-organic deposition in selective laser pyrolysis. Lines 125 micrometers wide were written in a film of metal neodecanoates, using an argon laser, prior to complete pyrolysis. An organic dye which absorbs selective laser light wavelengths, is added to the metallo-organic solution comprising the metal neodecanoates prior to laser exposure, so as to enhance absorption of the laser light at the regions of the metallo-organic film which are subsequently exposed to the laser light. The increased light absorbance at the exposed regions, results in at least partial pyrolysis of the exposed metal neodecanoates. Regions of the metallo-organic film not exposed to laser pyrolysis is developed away using a xylene wash. Subsequent complete pyrolysis of the metal neodecanoates and rapid thermal annealing produced lines having superconducting onsets above 90 K and zero resistance at 40 K.
REFERENCES:
patent: 4292347 (1981-09-01), Donley
Gupta et al., "Direct Laser Writing of Superconducting Patterns of Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7--8 ", Appl. Phys. Lett. 52 (8), Feb. 1988, pp. 665-666.
Gupta et al., "Laser Writing of Copper Lines from Metalorganic Films", Appl. Phys. Lett. 511, 26 Dec. 1987, pp. 2254-2256.
Gross et al., "Laser Direct--Write Metallization in Thin Palladium Acetate Films", J. Appl. Phys. 61(4) Feb. 1987, pp. 1628-1632.
Davison et al., "High Tc Superconducting Films from Metallo--organic Precursors", MRS vol. 99, Dec. 1987 (Boston), pp. 289-292.
Koch et al., "Thin Films and Squids Made from YBa.sub.2 Cu.sub.3 Cu.sub.y ", MRS edited by Gubser et al., Apr. 1987 (Anaheim), pp. 81-84.
Guruitch et al., "Preparation and Substrate Reactions of Superconducting Y--Ba--Cu--O films", Appl. Phys. Lett. 51 (13), Sep. 1987, pp. 1027-1029.
Yoshizako et al., "Chemical Etching of High--Tc Superconducting Y--Ba--Cu--O Films in Phosphoric Acid Solution", Jpn. J. Appl. Phys. 26, No. 9 (1987), pp. 533-534.
de Vries et al., "Preparation, Patterning, and Properties of thin YBa.sub.2 Cu.sub.3 O.sub.7-8 Films", Appl. Phys. Lett. 52 (22), May 1988, pp. 1904-1906.
Fisanick et al., "CW Laser Etching of Ba.sub.2 YCu.sub.3 O.sub.7 Films ", AIP No. 165, Nov. 1987, pp. 189-196.
Pampalone et al., "Contrast Enhancing Additives for Positive Photoresist", J. Electrochem. Soc. 135, No. 2 (1988), pp. 471-476.
Catalan Antonio B.
Mance Andrew M.
Mantese Joseph V.
Meyer Martin S.
Sell Jeffrey A.
General Motors Corporation
Hartman D. N. S.
King Roy V.
Morgenstern Norman
LandOfFree
Selective laser pyrolysis of metallo-organics as a method of for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Selective laser pyrolysis of metallo-organics as a method of for, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Selective laser pyrolysis of metallo-organics as a method of for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2299180