Fabrication of YBCO thin films by a MOCVD technique using a single solution source

단일원료를 사용한 MOCVD법에 의한 YBCO 박막의 제조

To establish the deposition condition of YBCO thin film on MgO single crystal substrates, processing parameters of deposition temperature, chemical composition and oxygen partial pressure were controlled. When using a Ba-deficient composition of YB $a_{1.8}$ $Cu_3$$O_{x}$, non-superconducting phase like CuO, $CuYO_2$ were formed, but BaCu02 was formed together with Yl23 phase when the starting composition was Ba-rich ($YBa_{2.3}$ $Cu_3$ $O_{x}$). The epitaxially grown Yl23 phase was formed at 760-$810^{\circ}C$ and $P_{O2}$=0.29-0.91 Torr.r.r.r.