The structural response of a ferroelectric BaTiO3/dielectric CaTiO3 superlattice to the bipolar applied electric field was studied using time-resolved x-ray microdiffraction. Structural results were compared to the po...
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Amorphous HfInZnO (HIZO) - thin film transistor (TFT) with the bottom gate structure were fabricated to investigate the effect of light illumination on the transfer curves and stability characteristics under negative ...
Amorphous HfInZnO (HIZO) - thin film transistor (TFT) with the bottom gate structure were fabricated to investigate the effect of light illumination on the transfer curves and stability characteristics under negative bias stress. The TFTs with passivation layers showed promising characteristics when measured in the dark, with a saturation mobility (µsat) of 9.0 cm2/Vs, a sub-threshold swing (SS) of 0.34 V/dec and an on/off ratio of ~108. However, when exposed to light of wavelengths below 500nm, the transfer curve changes remarkably, with an increase of SS and off-current (Ioff). The change in the transfer curves were also studied by examining them before and after negative bias-temperature-illumination stress. The increase of SS under light illumination can be due to the increase in the number of activated interfacial traps by photon energy.
Three europium-doped pyrochlores including La2Zr 2O7:Eu, La2Hf2O7:Eu, and Nd2Zr2O7:Eu were tested to determine their lifetimes as a function of temperature. These pyrochlores were examined to determine their suitabili...
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The utilization of thermal fluctuations or Johnson/Nyquist noise as a spectroscopic technique to experimentally measure transport properties is applied to Pb and Cu metal films. Through cross-correlation and autocorre...
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The utilization of thermal fluctuations or Johnson/Nyquist noise as a spectroscopic technique to experimentally measure transport properties is applied to Pb and Cu metal films. Through cross-correlation and autocorrelation functions obtained from power spectral density measurements, multiple transport coefficients are obtained through the Green-Kubo formalism. Supported rigorously by the underlying fluctuation-dissipation theory, this new experimental technique provides a direct measurement of absolute thermoelectric coefficients in addition to the electrical resistivity, electronic contribution to thermal conductivity, Lorentz number and various diffusion coefficients. This work reports the validation results of the experiment accomplished through the use of materials with thermoelectric properties widely accepted by the thermoelectric community, Pb and Cu. Further validation of the data was accomplished by comparing resistivity results to standard collinear four-probe resistivity measurements. Thermal fluctuation data for Pb at 300 K resulted in 5.9% and 2.02% agreement with the published Seebeck and four-probe resistivity data respectively. The Cu thermal fluctuation measurements at 300 K showed agreement within 3.76% and 6.14% for the published Seebeck and four-probe data respectively thus lending further credibility to the experimental method and underlying theory.
As a potential biological imaging probe with a long-wavelength of emission, InP quantum dots were prepared via a high-temperature organic solution approach, and successfully transferred into an aqueous system through ...
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Large-scale molecular-dynamics simulations are performed to study friction in nanoscale single asperity contacts. The modeling system consists of a tip made of H-terminated diamond-like carbon and an H-terminated diam...
Large-scale molecular-dynamics simulations are performed to study friction in nanoscale single asperity contacts. The modeling system consists of a tip made of H-terminated diamond-like carbon and an H-terminated diamond sample. Simulations are carried out using a reactive bond-order interatomic potential integrated with dispersive interactions. A quantitative agreement in contact pressures and shear strengths is achieved between our simulations and previously reported experimental studies. We show that the roughness theories capture the correct physics of deformation at the nanoscale. Our study provides a consistent explanation of the widely observed transition from a linear to sublinear dependence of the friction force on the applied load and we demonstrate that both regimes of friction are governed by the same physical phenomenon. Specifically, we show that friction is controlled by the mean number of atoms that interact chemically across the contact interface.
A kinetic model is developed to elucidate the nucleation rate of oxide islands during the initial stages of oxidation of metals. Our theoretical analysis shows that the nucleation of oxide islands requires a critical ...
A kinetic model is developed to elucidate the nucleation rate of oxide islands during the initial stages of oxidation of metals. Our theoretical analysis shows that the nucleation of oxide islands requires a critical oxygen pressure below which the nucleation rate is practically equal to zero and increases dramatically beyond it. The kinetic model shows that this critical oxygen pressure is many orders of magnitude larger than the equilibrium oxygen pressure predicted from the bulk thermodynamics. Comparison between the kinetic model and experimental data is made over a wide range of oxidation temperature.
Layer-by-layer (LbL) assembly was used to deposit transparent, highly conductive thin films using aqueous solutions of nanotubes stabilized by deoxycholate (DOC) and poly(diallyldimethylammonium chloride) (PDDA). Thre...
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We measured the thermal shock fracture and strength degradation of the commercially available BK-7 borosilicate crown optical glass as a function of surface finish prior to thermal shock testing and amount of temperat...
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