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Yao Y.B.,Hong Kong Polytechnic University | Yao Y.B.,King Abdullah University of Science and Technology | Liu W.C.,Hong Kong Polytechnic University | Liu W.C.,Applied MicroStructures | Mak C.L.,Hong Kong Polytechnic University
Journal of Alloys and Compounds

Samarium (Sm 3+) doped BiFeO 3 (BFO) ceramics were prepared by a modified solid-state-reaction method which adopted a rapid heating as well as cooling during the sintering process. The pyroelectric coefficient increased from 93 to 137 μC/m 2 K as the Sm 3+ doping level increased from 1 mol% to 8 mol%. Temperature dependence of the pyroelectric coefficient showed an abrupt decrease above 80 °C in all samples, which was associated with the increase of electrical conductivity with temperature. This electrical conduction was attributed to oxygen vacancy existing in the samples. An activation energy of ∼0.7 eV for the conduction process was found to be irrespective of the Sm 3+ doping level. On the other hand, the magnetic Néel temperature (T N) decreased with increasing Sm 3+ doping level. On the basis of our results, the effects of Sm doping level on the pyroelectric and electrical properties of the BFO were revealed. © 2011 Elsevier Ltd. All rights reserved. Source

Applied MicroStructures | Date: 2014-11-12

The present invention is related to carbon-doped metal oxide films. A method of depositing a low friction metal oxide film on a substrate is provided, including: using an atomic layer deposition technique, wherein said metal oxide film is deposited using at least an organo-metallic precursor, and wherein said substrate is at a temperature of 150 C. or lower during deposition of said metal oxide film, whereby a carbon-doped metal oxide film is obtained. The carbon-doped metal oxide films provide a low coefficient of friction, for example ranging from about 0.05 to about 0.4. In addition, the carbon-doped metal oxide films provide anti-stiction properties, where the measured work of adhesion is less than 10 J/m

Ben-Sasson A.J.,Technion - Israel Institute of Technology | Ankonina G.,Technion - Israel Institute of Technology | Greenman M.,Technion - Israel Institute of Technology | Grimes M.T.,Applied MicroStructures | Tessler N.,Technion - Israel Institute of Technology
ACS Applied Materials and Interfaces

We demonstrate a low-temperature layer-by-layer formation of a metal-oxide-only (AlOx) gate dielectric to attain low-voltage operation of a self-assembly based vertical organic field effect transistor (VOFET). The AlOx deposition method results in uniform films characterized by high quality dielectric properties. Pin-hole free ultrathin layers with thicknesses ranging between 1.2 and 24 nm feature bulk dielectric permittivity, εAlOx, of 8.2, high breakdownfield (>8 MV cm-1), low leakage currents (<10-7A cm-2 at 3MV cm-1), and high capacitance (up to 1 μF cm-2). We show the benefits of the tunable surface properties of the oxide-only dielectric utilized here, in facilitating the subsequent nanostructuring steps required to realize the VOFET patterned source electrode. Optimal wetting properties enable the directional block-copolymer based self-assembly patterning, as well as the formation of robust and continuous ultrathin metallic films. Supported by computer modeling, the vertical architecture and the methods demonstrated here offer a simple, low-cost, and free of expensive lithography route for the realization of low-voltage (VGS/DS ≤ 3 V), low-power, and potentially high-frequency large-area electronics. © 2013 American Chemical Society. Source

Applied MicroStructures | Date: 2012-05-22

A vapor delivery apparatus for providing a precursor vapor for a vapor deposition process includes a precursor container for holding a liquid or solid precursor. A first temperature control assembly maintains the precursor container at a first temperature to generate a vapor precursor from the liquid or solid precursor. An isolation valve is coupled to the precursor container, and a specific quantity of the vapor precursor is accumulated in an expansion volume. A fill valve, which is coupled to each of the isolation valve and the expansion volume, controls the flow of the vapor precursor from the precursor container into the expansion volume. A second temperature control assembly maintains the isolation valve at a second temperature greater than the first temperature.

Applied MicroStructures | Date: 2013-08-05

An article having a surface treated to provide a protective coating structure in accordance with the following method: vapor depositing a first layer on a substrate, wherein said first layer is a metal oxide adhesion layer selected from the group consisting of an oxide of a Group IIIA metal element, a Group IVB metal element, a Group VB metal element, and combinations thereof; vapor depositing a second layer upon said first layer, wherein said second layer includes a silicon-containing layer selected from the group consisting of silicon oxide, silicon nitride, and silicon oxynitride; and vapor depositing a third layer upon said second layer, wherein said third layer is a functional organic-comprising layer, wherein said functional organic-comprising layer is a SAM.

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