Improved Superconducting Properties of Thick YBa2Cu3O7−δ Film by Adding Amino-Rich Polyethyleneimine in Precursor Solution
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Polyethyleneimine (PEI) with an amount of –NH2 groups used in precursor solution could effectively reduce Cu2+ volatilization during the pyrolysis process. Thermogravimetric analysis shows that the temperature window of low-temperature pyrolysis for precursor solution with PEI (PEI-YBCO) is widened significantly. The slower pyrolysis process can enrich Cu2+ and improve critical current density (Jc) of PEI-YBCO films. The highest Jc is 3.03 MA/cm2 at 77 K when the amount of PEI is 0.5 g/10 mL and the film thickness is 400 nm. Then the thickness increases from 0.4 to 2.0 μm by changing the coating times. The Jc values of PEI-YBCO films decrease gradually with the thickness increase. However, the critical current (Ic) can be up to 197 A/cm (at 77 K, self-field) and Jc can still keep 1.68 MA/cm2 at 1.2 μm.
KeywordsPolyethyleneimine Metalorganic deposition method Thick film
This work was supported by the National Natural Science Foundation of China (21571126, 51572165, 11174193 and 51202141) the Shanghai Key Laboratory of High Temperature Superconductors (14DZ2260700) and the Science and Technology Commission of Shanghai Municipality (16521108400, 16DZ0504300 and 14521102800).
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