用三氟乙酸金属有机物沉积(TFA-MOD)方法在LaAlO3(100)基底上生长YBa2Cu3O7-δ(YBCO)超导薄膜,研究了向前驱液中添加聚乙烯吡咯烷酮(PVP)对YBCO薄膜微结构和超导性能的影响.涂膜在氧气环境中进行200～250℃热解,再经775℃氩气环境下结晶后获得YBCO超导薄膜.在相同热处理条件下,未添加PVP的前驱液制得的YBCO薄膜临界电流密度为4050A/cm2,添加PVP的前驱液制得的YBCO薄膜临界电流密度为5800A/cm2.后者表现出较少的孔洞,较强的c轴取向,较纯的双轴织构和较高的临界电流密度.因此,向前驱液中添加PVP的化学方法可以改进YBCO涂层导体的MOD制备过程.总压,氧分压和热处理温度等工艺条件将进一步优化,以提高临界电流密度.
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