Influence of interface reactions on the YBCO films grown by fluorine-free solution route

Abstract

Fabrication of full-stacked coated conductors by allchemical-solution routes exhibit a great potential in view of further reducing the cost and increasing the throughput for industrialization.Growth of YBa 2 Cu 3 O 7-x (YBCO) superconducting films by fluorine-free metal organic deposition routes (FF-MOD) which are environmental friendly has attracted more attentions recently. In this work, comparison study was performed on the YBCO-Ag superconducting thin films deposited on two types of single crystal substrates, LaAlO 3 and Ce 0.9 La 0.9 O 2-y /YSZ. The structural characterization and superconducting properties studies reveal that the interface reactions between the YBCO-Ag film and the CLO cap layer play an essential role on the nucleation and growth of YBCO-Ag films from the FF solution. Weak texture caused by serious interface reactions at high growth temperature is the main explanations for the poor superconducting performance when using CLO/YSZ as substrate. Further investigation of compatibility of the buffer layer for FF-derived YBCO films is needed.