High-quality Y-Ba-Cu-O thin films by PLD - Ready for market applications

Large-area poised laser deposition (PLD) has reached a state in terms of fi lm quality and reproducibility which makes possible now real market applica tions of PLD-YBa2Cu3O7-delta (YBCO) thin films on both sides of it-plane sa pphire substrates as HTSC devices in satellite and mobile communication sys tems. Bandpass filters optimized from PLD-YBCO thin films presently fulfill the requirements of the main national companies which are active in future communication techniques. A relatively simple PLD arrangement with fixed laser plume and rotating sub strate, with an offset between the laser plume and the center of the substr ate is employed to deposit laterally homogeneous 3-inch diameter Ag-doped Y BCO thin films. With the experience of more than 1,000 doable-sided 3-inch diam, films a high degree of homogeneity and reproducibility of j(c) and R- s is reached. The extension up to 8-inch substrate diameter will increase t he productivity of the flexible PLD technique considerably.