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Electrical properties of compacted assembly of copper oxide nanoparticles
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In this paper, both dc and ac electrical properties were measured on a compacted nanoparticle assembly and the dc electrical resistivity in the temperature range 140-300K was found to arise due to a variable range hopping conduction mechanism.Abstract:
Cu2O nanoparticles with diameters in the range 6.0-8.6nm were prepared by a chemical method. Both dc and ac electrical properties were measured on a compacted nanoparticle assembly. dc electrical resistivity in the temperature range 140-300K was found to arise due to a variable range hopping conduction mechanism. The ac resistivity variation as a function of frequency (in the range 10kHzto3MHz) and temperature (range 220–320K) was explained on the basis of the power-law exponent in percolating clusters. The interfacial amorphous phase of the nanoparticle assembly appears to control the electrical behavior of the system.read more
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P-type transparent conducting oxides.
TL;DR: This article provides a comprehensive review on traditional and recently emergent p-TCOs, including Cu(+)-based delafossites, layered oxychalcogenides, nd (6) spinel oxides, Cr(3+-based oxides), and post-transition metal oxides with lone pair state (ns (2).
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Acceptor Levels in p-Type Cu2O: Rationalizing Theory and Experiment
TL;DR: In this paper, the formation of $p$-type defects in transparent conducting oxides was investigated, giving rise to singleparticle levels that are deep in the band gap, consistent with experimentally observed activated, polaronic conduction.
Journal ArticleDOI
Understanding the p-type defect chemistry of CuCrO2
TL;DR: In this article, the authors examined the electronic structure, thermodynamic stability and the p-type defect chemistry of CuCrO2 using density functional theory with three different approaches to the exchange and correlation.
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Modeling the polaronic nature of p-type defects in Cu2O: The failure of GGA and GGA+U
TL;DR: For both methods, however, the positions of calculated transition levels are inconsistent with experimental ionization levels, and neither GGA nor GGA+U are successful in modeling p-type defects in Cu(2)O.
Journal ArticleDOI
Negative permeability spectra in Permalloy granular composite materials
TL;DR: In this article, a negative permeability has been obtained above 5GHz due to the natural magnetic resonance in the 70vol% particle content composite material and the electrical permittivity spectra show a nonmetallic characteristic.
References
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Journal ArticleDOI
A three-dimensional optical photonic crystal with designed point defects.
Minghao Qi,Elefterios Lidorikis,Peter T. Rakich,Steven G. Johnson,John D. Joannopoulos,Erich P. Ippen,Henry I. Smith +6 more
TL;DR: 3D photonic crystals that are particularly suited for optical device integration using a lithographic layer-by-layer approach are presented and optical measurements show they have resonant signatures around telecommunications wavelengths.
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Metal-nanoparticle single-electron transistors fabricated using electromigration
TL;DR: In this paper, single-electron transistors were fabricated from individual metal nanoparticles using a geometry that provided improved coupling between the particle and the gate electrode. But their performance was limited due to their small diameter.
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Magnetic bipolar transistor
TL;DR: A magnetic bipolar transistor is a bipolar junction transistor with one or more magnetic regions, and/or with an externally injected nonequilibrium (source) spin this article, and it is shown that electrical spin injection through the transistor is possible in the forward active regime.
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Thermodynamic Criterion for the Stability of Amorphous Intergranular Films in Covalent Materials.
TL;DR: The studies show that all high-energy grain boundaries in a model covalent material, silicon, exhibit a universal amorphous structure, whereas low-energy boundaries are crystalline, which allows the identification of a thermodynamic criterion for the existence of stable disordered intergranular films.