The fabrication of YBa₂Cu₃O_7−xfilm by metal–organic deposition using terpineol-modified trifluoroacetates

Abstract

Dense and homogeneous superconductive YBa2Cu3O7−x (YBCO) thin films were grown epitaxially on single-crystal LaAlO3 (LAO) substrates by a new MOD method with terpineol-modified trifluoroacetic solution. The YBCO precursor solution incorporated with terpineol enabled a remarkable decrease in the organic pyrolysis process. The YBCO films have an onset critical temperature of 90 K and Jc (77 K, 0 T) of 3.8 MA cm−2. The addition of terpineol was suggested to be responsible for the smoother and low-stressed YBCO films.

A rapid process of YBa2Cu3O7−δthin film fabrication using trifluoroacetate metal–organic deposition with polyethylene glycol additive

“…The narrowing of the decomposition temperature range could be verified by comparing DTA curves A and B in figure 9. Therefore, the decomposition reaction speed during the pyrolysis process was promoted by PEG addition, which was different from the broadening of the decomposition temperature range using terpineol additive by Ding et al [34].…”

Rapid Pyrolysis of SmBa2Cu3O7-δ Films in CSD-MOD Using Extremely-Low-Fluorine Solutions

“…In order to overcome this limitation, several advanced MOD methods have been developed in recent years [17][18][19][20][21]. In our previous work [22], various precursor solutions with different fluorine contents have been tested, including the conventional low-fluorine (CLF) solution with a fluorine content of 54% (F-54%), the super low-fluorine (SLF) solution (F-31%), and the extremely-low-fluorine…”

A water-free metal organic deposition method for YBa2Cu3O7−δthin film fabrication

“…For the TGA curves (inset in figure 2), the mass loss of PAn or PAnD sample initialized at about 200 • C, and completed at about 320 • C. Thus the decomposition temperature range of PAn and PAnD samples could be estimated as about 120 • C, which was also broader than that of the conventional TFA solution sample (about 80 • C). The broadening of the decomposition temperature range was also found in the study of terpineol additive by Ding et al [16]. They suggested that this phenomenon could be related to the alleviation of stress generated during the decomposition reactions, thus smooth films could be obtained after a rapid pyrolysis step.…”

“…Such a long pyrolysis step is designed because strong internal stresses accompany the decomposition reactions, and buckling or cracking might occur such that the final YBCO films are degraded [10,11]. In order to shorten the pyrolysis time, various improvements of the precursor solution preparation have been proposed in the past decade, such as lowering the fluorine content [12][13][14], using organic additives [15][16][17], and using trifluoroacetic anhydride (TFAA) [18]. Low-fluorine solution has been proven efficient by many groups, because the generation of fluorine-related gases could be reduced and the stress could be alleviated [12].…”