Download or read book Mechanical Properties and Resistivity of Gold and Gold vanadium Oxide Thin Films written by Kittisun Mongkolsuttirat and published by ProQuest. This book was released on 2009 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pure Au films deposited at room temperature have an electrical resistivity that is higher than the published value for bulk gold. Increasing the substrate temperature during deposition was shown to strongly affect the grain size of the Au thin films. Whereas the elastic modulus is unaffected by the grain size, resistivity and hardness decrease at high temperature. An electrical resistivity model based on a combination of the Fuchs-Sondheimer and Mayadas-Shatzkes models for electron scattering fit the data well. The hardness dependence on grain size was explained using the Hall-Petch equation. Together, these results demonstrate that it is possible to reduce the resistivity by depositing at high temperature, but some loss of hardness is likely.
Download or read book Temperature Dependent Mechanical Behavior of Silicon Dioxide Gold and Gold vanadium Thin Films for VLSI Integrated Circuits and MicroElectroMechanical Systems MEMs written by Ming-Tzer Lin and published by . This book was released on 2003 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: We also determined the modulus of gold and gold vanadium, and discovered that there is some evidence for a vanadium concentration dependence of the mechanical properties.
Download or read book Electrical Resistivity of Thin Metal Films written by Peter Wissmann and published by Springer. This book was released on 2007-04-19 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intent of this book is to report on the electrical, optical, and structural properties of silver and gold films in dependence on substrate material, annealing treatment, and gas adsorption. A main point is the calculation of the scattering cross section of the conduction electrons. All results are substantiated by extended experimental data, as well as numerous illustrations and tables.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book GROWTH AND FUNCTIONALITIES OF VANADATE THIN FILMS written by Haitian Zhang and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition metal oxides have attracted tremendous research interest due to their fertile functional properties, including ferroelectricity, magnetism, high temperature superconductivity and metal to insulator transition (MIT). Over recent decades, one of the research focuses has been utilizing these functional features in device applications, which requires a deeper understanding of the material science and also advances in thin film deposition in order to tailor these properties. The binary vanadium dioxide has drawn much attention due to its orders of magnitude change in resistivity during the MIT near room temperature, opening up the possibilities to use this material as next generation transistors, memory devices and radio frequency switches in communication applications. However, to bridge the gap between the frontier of fundamental research in VO2 films and their realization in commercial products, wafer scale growth of the oxide thin films with electronic grade is necessary. This task requires precise control over the valence state of normally multivalent transition metal cations, while the device performance will be largely derogated if the valence state is not well controlled. To deposit the VO2 with precise valence state control on wafer scale, a combinatorial approach was used to establish a valence state gradient of vanadium cation, from which the optimal condition for stoichiometric VO2 was extracted. Under the optimal growth condition, a high quality 30-nm thick VO2 film was grown on 3 inch sapphire wafer, showing the highest MIT resistivity ratio for ultrathin films on wafer scale, which is relevant for modern device applications.Besides the growth of high quality MIT thin films on wafer scale, a novel strategy to optically write and erase complex circuitry into VO2 thin films was also developed. Weve successfully demonstrated the optically induced MIT in VO2 which is persistent after the light source is turned off. We use this method to optically imprint local conductive areas into an otherwise insulating VO2 film. In contrast to conventional thin film patterning techniques that require chemical etching of patterns defined through lithography steps, the optical imprint is performed by irradiating single crystalline VO2 thin films with focused ultraviolet light in a nitrogen atmosphere. A conductive pattern is sketched into the resistive VO2 matrix, resulting in a close to 4 orders of magnitude increase in electrical conductivity at room temperature. Significantly, the inscribed pattern, which is permanent, can be completely erased by a few minutes thermal annealing process at moderately elevated temperature. This development can potentially find its application in reconfigurable optical elements. It can also be harnessed as rewritable bottom electrode material for back-gating structures by inscribing complex contacting schemes using UV radiation. Beyond the binary vanadium oxides, Mott insulators such as LaVO3 have recently been suggested as promising solar cell materials with suitable band gap, high absorption coefficient, as well as the potential to beat the Shockley-Queisser limit owing to their unique strong electron-electron correlation effect that is not present in conventional semiconductors. However, the quality of strongly correlated oxides has been far inferior compared to conventional semiconductors. The high defect concentration of oxide thin films impedes the realization of Mott solar cells with competitive performance due to the lack of stoichiometry control. By taking advantage of the unique self-regulated growth mechanism available in hybrid molecular beam epitaxy, strongly correlated LaVO3 films were grown which revealed a record-low defect concentration. The optical and electrical properties of these films were studied as a function of stoichiometry and a more than two orders of magnitude improvement in defect-related properties compared to results reported in literature was demonstrated, showing that Mott insulators can indeed be synthesized with high perfection using hybrid molecular beam epitaxy.
Download or read book BTL Talks and Papers written by Bell Telephone Laboratories, inc. Technical Information Libraries and published by . This book was released on 1981 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1996 with total page 1628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Auger Electron Spectroscopy written by Donald T. Hawkins and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: Auger electron spectroscopy is rapidly developing into the single most powerful analytical technique in basic and applied science.for investigating the chemical and structural properties of solids. Its ex plosive growth beginning in 1967 was triggered by the development of Auger analyzers capable of de tecting one atom layer of material in a fraction of a second. Continued growth was guaranteed firstly by the commercial availability of apparatus which combined the capabilities of scanning electron mi croscopy and ion-mill depth profiling with Auger analysis, and secondly by the increasing need to know the atomistics of many processes in fundamental research and engineering applications. The expanding use of Auger analysis was accompanied by an increase in the number of publications dealing with it. Because of the developing nature of Auger spectroscopy, the articles have appeared in many different sources covering diverse disciplines, so that it is extremely difficult to discover just what has or has not been subjected to Auger analysis. In this situation, a comprehensive bibliography is obviou-sly useful to those both inside and outside the field. For those in the field, this bibliography should be a wonderful time saver for locating certain references, in researching a particular topic, or when considering various aspects of instrumentation or data analysis. This bibliography not only provides the most complete listing of references pertinent to surface Auger analysis available today, but it is also a basis for extrapolating from past trends to future expectations.
Download or read book Optical and Electronic Properties of Fluorine doped Vanadium Oxide Thin Films written by Romesh M. Jessani and published by . This book was released on 1991 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ceramic Abstracts written by and published by . This book was released on 2000 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth Control of the Oxidation State in Vanadium Oxide Thin Films written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Precise control of the chemical valence or oxidation state of vanadium in vanadium oxide thin films is highly desirable for not only fundamental research, but also technological applications that utilize the subtle change in the physical properties originating from the metalinsulator transition (MIT) near room temperature. However, due to the multivalent nature of vanadium and the lack of a good understanding on growth control of the oxidation state, stabilization of phase pure vanadium oxides with a single oxidation state is extremely challenging. Here, we systematically varied the growth conditions to clearly map out the growth window for preparing phase pure epitaxial vanadium oxides by pulsed laser deposition for providing a guideline to grow high quality thin films with well-defined oxidation states of V22O3, V+4O2, and V2+5O5. A well pronounced MIT was only observed in VO2 films grown in a very narrow range of oxygen partial pressure P(O2). The films grown either in lower (10 mTorr) or higher P(O2) ( 25 mTorr) result in V2O3 and V2O5 phases, respectively, thereby suppressing the MIT for both cases. We have also found that the resistivity ratio before and after the MIT of VO2 thin films can be further enhanced by one order of magnitude when the films are further oxidized by post-annealing at a well-controlled oxidizing ambient. This result indicates that stabilizing vanadium into a single valence state has to compromise with insufficient oxidation of an as grown thin film and, thereby, a subsequent oxidation is required for an 3 improved MIT behavior.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Platinum Metals Review written by and published by . This book was released on 1971 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superconductivity written by Cambridge Scientific Abstracts, Inc and published by . This book was released on 1973 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1991-07 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
