Nazari, Heydar HonarvarDejam, Laya
10页查看更多>>摘要：We investigated various structural, optical, and photoluminescence (PL) properties of as-deposited and postannealed Al:ZnO (AZO) thin films deposited by sputtering. X-Ray Diffraction (XRD) analysis indicated that a higher annealing temperature led to modifying the crystalline orientation from (002) to (110). Grain sizes of asdeposited AZO were as large as 12.8 nm, yet post-annealing increased them to 18.4 nm. Optical band gaps were determined to be in the range of 3.4-4 eV, which annealing caused noticeable decreasing in the band gaps. Postannealing could suppress the Urbach tail values from 0.573 to 0.276 eV. PL emission intensities improved more than 30 times as the result of suppressing the localized states. Both crystallinity and excitation wavelengths could play important roles on emission wavelengths; particularly if the value of excitation energy is close to that of the optical band gap. Fabricated AZO had suitable for light emitting diode (LED) and biological applications.
原文链接:
NSTL
Elsevier
De, ArnabDwij, VivekSathe, VasantHernandez-Rodriguez, M. A....
9页查看更多>>摘要：In this work we demonstrate that large temperature sensitivity over a wider temperature range is possible by adopting the dual use of Raman and photoluminescence (PL) signals emitted by rare-earth doped crystalline phosphors when excited by a suitable laser light. We define Raman-PL-intensity ratio (RPIR) as an alternative thermometric parameter to define temperature sensitivity and exploited the contrasting effect of temperature on the intensities of the PL and Raman lines of a Eu3+-doped BaTiO3 ferroelectric phosphor and achieved large temperature tuning of color (red <-> blue/green) and large relative temperature sensitivities in a wide temperature range: +6.4 %K-1 at 65 K, +2.4 %K-1 at 303 K. Our strategy offers greater flexibility for the design of phosphor systems for optical thermometry with high sensitivity.
原文链接:- NSTL
- Elsevier
Uludag, CemKoc, KenanKarabul, YasarKilic, Mehmet...
8页查看更多>>摘要：This study has been focused on preparing Poly (3-hexylthiophene-2,5-diyl)/Camphor Sulfonic Acid (P3HT/CSA) composites in the bulk and studying their frequency-dependent electrical properties including complex permittivity, tangent loss, complex electrical modulus, impedance, and conductivity for revealing the energy storage potential of the samples. While the structural characterizations of the samples have been realized by Fourier Transformed Infrared (FT-IR) spectroscopy and Scanning Electron Microscope (SEM) images, electrical measurements have been performed by using an impedance analyzer between 20 Hz and 10 MHz. The complex permittivity analysis of the samples has uncovered that the CSA supplement has a positive effect on increasing both the energy storage ability and conductivity of P3HT. Especially, the fact that the composite containing 0.011 M CSA has a higher epsilon' value, lower tangent loss, and higher conductivity than all samples, making this composite attractive for many applications. Moreover, it has been determined for the first time that P3HT has a phase difference very close to -90 degrees at high frequencies (3-10 MHz) which is an indicator of supercapacitive nature of P3HT.
原文链接:- NSTL
- Elsevier
Das, SubhenduDebbarma, ManishGhosh, DebankitaChanda, Sayantika...
12页查看更多>>摘要：Structural, mechanical, electronic, magnetic and thermoelectric characteristics of Ba2CaMO6 (M = Re, Os) double perovskites have been calculated using first-principle based full-potential linearized augmented plane wave (FP-LAPW) approach. Optimized ground-state lattice constants of the compounds are in fair resemblance with the respective available experimentally investigated data. Calculated elastic constants and moduli show mechanical stability, anisotropy, ductility and significant stiffness. Computed spin-polarized electronic properties with a diversity of exchange-correlation potential schemes have revealed their half-metallic nature. Estimated spin magnetic moments indicate their ferromagnetic nature with major contributions from the 5d state of transition elements Re and Os. The present study has projected both the perovskite compounds as prospective magnetic materials for a variety of half-metallic, ferromagnetic and spintronic applications. Calculated thermoelectric parameters have predicted their scope of thermoelectric applications in high temperature waste heat management.
原文链接:- NSTL
- Elsevier
Khettou, A.Mari, B.All, N. AbdelKhouqeer, G....
19页查看更多>>摘要：ZnO/Si heterojunctions have potential applications in optoelectronic devices. The study of their characteristics is quite important to optimize their properties. We report here the effect of annealing on different proprieties of In doped ZnO thin films deposited on glass substrate and p-type silicon (100) wafers using pulsed laser ablation. The structural, optical and electrical properties were studied with various techniques. After heat treatment, the transmittance increases which confirms the reduction of roughness and band gap energy from 3.44 eV to 3.39 eV. Further, the electrical measurements show an increase in conductivity and evidences the presence of a small polaron jump and a variable range jump during the conduction process at high and low temperatures, respec-tively. Current-voltage confirms the presence of space charge zone. Finally, capacitance-voltage measurements at different frequencies were performed to estimate the acceptor concentrations and the built-in potential. Such transparent and smooth layer is interesting to concept optoelectronic devices bases on ZnO/Si heterojunction.
原文链接:- NSTL
- Elsevier
Leeladevi, K.Arunpandian, M.Kumar, J. VinothChellapandi, T....
12页查看更多>>摘要：Herein, well-designed eco-friendly CoWO4/ZnO (CoW/Zn) nanocomposite was fabricated by straightforward hydrothermal method using beyond any harmful surfactants or template. The structure and morphology of samples were characterized by XRD, FT-IR, SEM, and UV-Vis DRS analysis. The photocatalytic behavior of CoW/ Zn nanocomposite was examined by the deterioration of ciprofloxacin (CIP) drug and methylene blue (MB) dye under visible light irradiation. The CoW/Zn nanocatalyst exhibits excellent catalytic activity to the elimination of CIP drug and MB dye with 93.13% and 98.65% of efficiency, respectively. Radical trapping experiment proved that the.OH species portray a major part in the photodegradation process. In addition, the CoW/Zn nanocomposite showed better repeatability efficiency. The present study developed a new strategy to fabricate the recoverable CoW/Zn nanocomposite for the degradation of hazardous organic moiety from the circumstance.
原文链接:- NSTL
- Elsevier
Abboudi, HassanEl Ghazi, HaddouBenhaddou, FaridEn-Nadir, Redouane...
7页查看更多>>摘要：In this study, we explore the effects of several types of confinement potential on the photovoltaic conversion properties of a single-intermediate band solar cell based on (In,Ga)N quantum well emerged in the intrinsic area of the typical p-i-n structure. The ground-state intermediate band position and width associated with electron discrete quantized energy level are derived by using the finite difference approach to solve the impurity-related time-independent Schro center dot dinger equation. Making an allowance for the impurities and holes generally ignored in such studies, open-circuit voltage, current density, fill factor, and photovoltaic efficiency are numerically calculated. The results reveal that the triangular potential profile outperforms rectangular and parabolic profiles in terms of solar cell performance. Furthermore, regardless of the architectural profile, it is revealed that the performance of solar cells diminishes with increasing temperature. However, this shrinkage is strongly-shape dependent.
原文链接:- NSTL
- Elsevier
