Semitransparent metal or distributed Bragg reflector for wide-viewing-angle organic light-emitting-diode microcavities.

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FATIGUE AND RETENTION IN FERROELECTRIC Y-BA-CU-O/PB-ZR-TI-O/Y-BA-CU-O HETEROSTRUCTURES

Fatigue and retention characteristics of ferroelectric lead zirconate titanate thin films grown with Y-Ba-Cu-O(YBCO) thin-film top and bottom electrodes are found to be far superior to those obtained with conventional Pt top electrodes. The heterostructures reported here have been grown in situ by pulsed laser deposition on yttria-stabilized ZrO2 buffer [100] Si and on [001] LaAlO3. Both the a- and c-axis orientations of the YBCO lattice have been used as electrodes. They were prepared using suitable changes in growth conditions

FERROELECTRIC BISMUTH TITANATE SUPERCONDUCTOR (Y-BA-CU-O) THIN-FILM HETEROSTRUCTURES ON SILICON

The growth by pulsed-laser deposition of c-axis-oriented bismuth titanate (BTO)/YBa2Cu3O7(YBCO) superconductor heterostructures on [001]-oriented Si with epitaxial yttria-stabilized ZrO2 as a buffer layer is reported. X-ray-diffraction studies of the heterostructures show that all the layers grow in the c-axis orientation, with a rocking angle of 1.0-degrees-1.2-degrees for the bismuth titanate layer and 0.6-degrees-0.8-degrees for the YBCO layer. Rutherford backscattering ion channeling yields of 28% at the surface have been obtained. Transmission electron microscopy of cross-sectioned samples reveal that the BTO layer has a significant density of translational boundaries that propagate at 45-degrees to the film surface. The BTO film exhibits ferroelectric hysteresis and a dielectric constant in the range of 180-200