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Book Fabrication and Characterization of Epitaxial Yba2cu3oy Thin Films on Double Buffered Silicon Substrates

Download or read book Fabrication and Characterization of Epitaxial Yba2cu3oy Thin Films on Double Buffered Silicon Substrates written by Ho-Yi Eric Wong and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Fabrication and Characterization of Epitaxial YBa2Cu3Oy Thin Films on Double-buffered Silicon Substrates" by Ho-yi, Eric, Wong, 黃灝頤, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled FABRICATION AND CHARACTERIZATION OF EPITAXIAL YBa Cu O 2 3 y THIN FILMS ON DOUBLE-BUFFERED SILICON SUBSTRATES submitted by WONG HO YI ERIC for the degree of Master of Philosophy at The University of Hong Kong in August 2003 The discovery of perovskite copper oxide YBa Cu O (YBCO) has aroused a 2 3 y constantly increasing interest in this material due to the potential applications in microelectronics devices, such as microwave elements, multilayer junctions, etc. Suitable substrates with a low dielectric constant, good high frequency properties, large size and low cost are necessary. Silicon substrates are widely used and well developed in the semiconductor industry and microwave device applications. Therefore, successful fabrication of high T YBCO films on silicon is of interest for various applications of hybrid superconductor-semiconductor devices and interconnected circuits. In such applications, the epitaxial growth of YBCO on silicon is extremely important. This thesis presents a systematic investigation of the fabrication and characterization of epitaxial YBCO thin films on silicon substrates with a double buffer of Eu CuO (ECO)/YSZ(Yttria-Stabilized Zirconia). Silicon (001) substrates 2 4 were prepared using a chemical etch by dilute HF acid prior to thin film deposition. The YBCO thin films were grown via an entirely in situ process using an on-axis rf magnetron sputtering method with optimized deposition parameters including the deposition temperature, operating pressure and partial oxygen pressure. The crystallinity, surface morphology, electrical properties, and interface of the obtained YBCO/ECO/YSZ thin films were studied by x-ray diffraction, surface profiler, atomic force microscope, optical microscope, standard dc four-probe measurements and small angle x-ray reflection. The X-ray diffraction patterns showed that all the thin films were highly c-axis oriented. A full width of 0.69 at half maximum of the YBCO(005) peak was obtained. This was smaller than reported in previous studies of YBCO thin films on double buffered silicon or nickel substrates. The atomic force microscopy image showed that the ECO buffer surface was flat and smooth. The average roughness over a wide scanning region of 2000m was less than 25nm. The optical microscope images showed that the surface morphology of the grown YBCO thin films was significantly improved by the ECO buffer layer since ECO had a very stable 214-T' crystal structure and very small lattice mismatch with YBCO. The YBCO/ECO/YSZ multilayers were further characterized by small angle x-ray reflection. The surface roughness of the YBCO layers decreased when an ECO buffer was added. No intermediate layer was found at the YBCO/ECO and ECO/YSZ interfaces. The results suggest that ECO is chemically compatible with YBCO and YSZ. The superconductivity of YBCO films was significantly improved by the ECO/YSZ double buffer. This is indicated by the fact that YBCO thin films on silicon substrates with an ECO/YSZ double buffer showed a higher T than that grown on YSZ/Si without the ECO layer. The advantages of using ECO/YSZ double buffer layers in deposition of YBCO on silicon were clearly demonstrated. It would provide a good basis for the potential applications of YBCO on other semiconductors, metallic or me

Book Fabrication Irradiation Oxygenation and Magnetic Characterization of BI 2212 High Tc Superconducting Thick Films

Download or read book Fabrication Irradiation Oxygenation and Magnetic Characterization of BI 2212 High Tc Superconducting Thick Films written by David D. Paul and published by . This book was released on 1994 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Book Advances in Superconductivity VI

Download or read book Advances in Superconductivity VI written by Toshizo Fujita and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1359 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than seven years have passed since the dramatic breakthrough in the critical temperature for superconductors. During this period, a host of new materials have been discovered, and efforts have been stepped up in a variety of domains including device and systems applications, commercialization, and basic research on the properties of superconductive materials. Recent progress in areas such as bulk single crystal production, long-scale wire and tape produc tion, flywheel and bearing applications, and electronic device applications for thin films indicate that science and technology have been working hand in hand in this field, as has been the case in the research and development of semi conductors. This interdisciplinary "resonance" will be certain to lead to further outstanding advances in the years to come. It goes without saying that worldwide information exchange is the key to accelerating progress in superconductivity science and technology. As in previous years, the ISS '93 served as a venue where visions of future develop ments were shared in addition to presentations and extensive discussions on the most up-to-date research results. I hope that the Proceedings contained in this volume will be consulted not only as a summary of the current "state of the art" in high-Tc superconductivity but also as a stimulating source of ideas regarding future applications of superconductivity research.

Book Physics Briefs

Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Fabrication and the Characterization of Hg based Cuprate Superconducting Thin Films

Download or read book The Fabrication and the Characterization of Hg based Cuprate Superconducting Thin Films written by Sang-Ho Yun and published by . This book was released on 1996 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fabrication Characterization and Properties of Nd2 x Cex CuO4 y Superconducting Thin Films and Heterostructures

Download or read book Fabrication Characterization and Properties of Nd2 x Cex CuO4 y Superconducting Thin Films and Heterostructures written by Sining Mao and published by . This book was released on 1995 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fabrication Characterization and Application of High Temperature Superconducting Mercury Based Cuprate Thin Films

Download or read book Fabrication Characterization and Application of High Temperature Superconducting Mercury Based Cuprate Thin Films written by and published by . This book was released on 1999 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major experimental achievements obtained during the project period are summarized in the following session. Existing problems and possible solutions are also discussed. Details associated to each specific subject can be found in 5 US patent disclosures (2 awarded. 1 transferred to industry. and 2 pending) and 37 papers (31 published/accepted and 6 submitted) and among them 35 are referred journal articles and 2 are conference proceedings). Objectives were: Fabrication of Epitaxial Hg-based HTS thin films; Characterization of physical properties of the film; Application in microelectronics.

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fabrication and Characterisation of Nd 123 High temperature Superconducting Thick Films on Yttria Stabilized Zirconia Substrates

Download or read book Fabrication and Characterisation of Nd 123 High temperature Superconducting Thick Films on Yttria Stabilized Zirconia Substrates written by Mohamed A. A. Moussa and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book International Aerospace Abstracts

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1995 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fabrication and Microstructural Characterization of Superconductive YBa2Cu3O7 x Thin Films Grown by Dc Reactive Magnetron Sputtering

Download or read book Fabrication and Microstructural Characterization of Superconductive YBa2Cu3O7 x Thin Films Grown by Dc Reactive Magnetron Sputtering written by Torbjörn I. Selinder and published by . This book was released on 1992 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: