Polymer assisted thick single-layer YBa_2Cu_3O_(7-δ)films prepared with modified TFA-MOD method

摘要

Single-layer YBa2Cu3O7-d(YBCO) films with the thickness of over 600 nm were fabricated by modified metal organic deposition using trifluoroacetate metal organic deposition(TFA-MOD) method on LaAlO3(LAO) substrates. Polyvinylbutyral(PVB) was added into the precursor solution to enhance the thickness of the single layer. The pyrolysis process was shortened to about 3 h due to the reduction of the fluorine content in the precursor solution.The effects of heating rate during the crystallization process on the microstructure and Jcvalues of YBCO films were investigated. The a-axis-oriented YBCO crystals dominate when the heating rate is lower than 20 °Cámin-1, while faster heating rate of 43 °Cámin-1results in pure c-axis epitaxial growth. The Jcvalues of YBCO films increase linearly with heating rate increasing due to the increase of c-axis YBCO growth, and the critical current(Ic) value of 100 Aácm-1within a single-layer YBCO film is achieved.