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Showing 1 to 20 of 38 for “"cuprous oxide"”.
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Resistance switching of electrodeposited cuprous oxide
… switching behavior of electrodeposited cuprous oxide (Cu<sub>2</sub>O) thin films in Au/Cu<sub>2</sub>O/top electrode (Pt, Au-Pd, Al) cells was studied. After an initial FORMING process, the fabricated cells show reversible switching between a low resistance state (16.6 Ω) and a high …
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Lifetimes of Excitons in Cuprous Oxide
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-19T19:15:39Z No. of bitstreams: 1 Jang_Joon.pdf: 10079899 bytes, checksum: 98598584fa2b6ebd1cc4d1b1b3954f26 (MD5)
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Relaxation kinetics of excitons in cuprous oxide
Cuprous oxide is a thoroughly s~udied semiconductor with long-lived, mobile excitons. The kinetic energy distribution of the excitons is reproduced in phonon-assisted luminescence spectra. When non-equilibrium excitons are produced by a laser pulse, nanosecond-time-resolved luminescence reveals the …
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Bose-Einstein condensation of excitons in cuprous oxide
Free excitons provide the only experimental system other than helium in which the behavior of particles with mass is known to follow Bose-Einstein statistics. I present experimental observations of the kinetic energy distribution of excitons in the direct-gap semiconductor Cu$\sb2$O, both the …
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Electrochemical self-assembly of copper/cuprous oxide layered nanostructures
<p>"Layered nanostructures of copper metal and cuprous oxide are electrodeposited from alkaline solutions of Cu(II) lactate at room temperature. The electrode potential oscillates spontaneously during constant-current deposition. The potential oscillations are attributed to the formation and …
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Excitons in cuprous oxide: high mobilities and strain confinement
… properties of excitons in the semiconductor cuprous oxide (CU0) at 2liquid helium temperatures. The lowest lying member of the yellow exciton series, the paraexciton, is the main focus of these studies. The technique cf time-resolved luminescence imaging was used to measure the transport …
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Defect Engineering in Cuprous Oxide (Cu₂O) Solar Cells
This thesis is focused on the development of a cuprous oxide (Cu₂O) thin-film (TF) solar cell that is fabricated by manufacturing-friendly methods such as electro-deposition, sputtering and atomic layer deposition. Due to its bandgap of close to 2 eV, it has the potential of being applied as top …
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Bose-Einstein condensation of excitons in uniaxially stressed cuprous oxide
Excitons in Cu$\sb2$O have been demonstrated to be a nearly ideal gas of bosons, providing a unique system for studying Bose-Einstein statistics and Bose-Einstein Condensation of an ideal gas in the laboratory. In this study, I have applied uniaxial stress to optimize the conditions for a …
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Defect engineering of cuprous oxide thin-films for photovoltaic applications
… them compatible with terawatts-level deployment. Cuprous oxide (Cu₂O) is an earthabundant semiconductor with desirable properties for light-absorbing layers. However, power conversion efficiencies of solar cells comprising this absorber material remain significantly below the theoretical limit. In …
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The Effect of Grain Boundaries on The Electrical Conductivity of Cuprous-Oxide
Made available in DSpace on 2014-12-10T17:32:33Z (GMT). No. of bitstreams: 1 6500105.pdf: 3207817 bytes, checksum: 15d7cf6168aa1870a53c2baeeedefa68 (MD5) Previous issue date: 1964
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Soft x-ray near edge spectroscopy of cuprous oxide and silicon-germanium alloys
High resolution soft x-ray absorption near edge structure (XANES) spectra have been obtained for CU20 and for SiGe1-x semiconductor alloys, xas a function of composition x, using the methods of partial electron yield and thin film absorption. The shapes of the near edge features provide a unique …
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Exploiting polar interfaces for photocatalytic water splitting: application to the anatase-cuprous oxide heterojunction
… compensation mechanisms in the anatase (TiO2) / cuprous oxide (Cu2O) heterojunction, a system which has recently been realized in experiment. Due to its low valence band edge, anatase has a good oxidation potential; by contrast cuprous oxide has a good reduction potential due to its high …
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Elucidating efficiency losses in cuprous oxide (Cu₂O) photovoltaics and identifying strategies for efficiency improvement
… and characterized a series of thin-film cuprous oxide (Cu₂O) photovoltaic devices. I constructed several different device designs, using sputtered and electrochemically deposited Cu₂O. Characterization was done using XRD, SEM, optical spectroscopy, quantum efficiency, current-voltage, and …
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Developing cuprous oxide thin film characterization techniques to illuminate efficiency-limiting mechanisms in photovoltaic applications
… semiconductors for solar conversion such as cuprous oxide (Cu₂O). Poor solar energy conversion efficiency (<2%) has hindered the development of this material, yet it is not well understood what is preventing the material from approaching the idealized maximum efficiency of 20%. The present …
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Photoluminescence studies of the yellow series free exciton in cuprous oxide using pulsed and continuous wave tunable dye lasers
Digitized by Kansas Correctional Industries
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The optical properties of oxide films on copper and copper alloys
… conditions were selected to allow thin, thermal oxide films consisting of cuprous oxide only to be grown on copper and dilute copper alloy substrates. The identity of the oxide was confirmed by x-ray diffraction and coulometry. Spectral measurements covering the wavelength range 350 - 750 nm were …
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The Structure and Composition of Metal Surfaces
… features producing preferential nucleation of cuprous oxide on low index copper faces could not be analysed by the dark field technique mentioned above, detailed information is provided by two-beam dark field and weak beam imaging using copper reflections. The three-dimensional shape of the …
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Fabrication of three-dimensional nanostructures for thermal study
… of 400 nanometer sized silica nanoparticles, cuprous oxide film was epitaxially grown into the template using electrodeposition. These three-dimensional, sub-100 nanometer silicon nanostructures and three-dimensional epitaxial cuprous oxide nanostructures are similar to the length scale of the …
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Field survival of Xanthomonas cucurbitae, the causal agent of bacterial spot of pumpkin, and efficacy of selected chemicals and biocontrol agents for control of the diseases
… from 0.17 ppm mancozeb (Dithane) to 64.53 ppm cuprous oxide (Nordox) in NB, and from 0.23 ppm mancozeb (Dithane) to 38.87 ppm cuprous oxide (Nordox) in CYE. Similarly, the EC100 values of the chemicals ranged from 1 ppm mancozeb (Dithane) to 175 ppm cuprous oxide (Nordox) in NB, and from 1 ppm …
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Atmospheric Corrosion of Ag and Cu with Ozone, UV and NaCl
… that less stable silver compounds such as oxide and sulfate are possible corrosion products in field even silver chloride is the dominant corrosion product forming in field. This prediction was confirmed by analysis of field exposed Ag samples. By quantification of corrosion products, it is …
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