Papers by Keyword: Nickel Oxide (NiO)

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Authors: Ming Wei Li, Nan Hai Sun, Yun Wang Ge, Bo Lei Yao
Abstract: This paper presents a new buffering layer(nickle oxide thin film) of organic solar cells. Nickle Oxide(NiO) thin film is a good alternative of hole tansporting layer. We investigates the film from physical and electrical aspects, such as morphology, deposition temperature, thickness etc. We find that the optimum fabrication conditions are: room temperature deposition, 10nm of thickness, and 30% oxygen proportion. The device strcture is Anode/NiO/P3HT[regioregular of poly(3-hexylthiophene)]: PCBM[(6,6)-phenyl C61 butyric acid methyl ester] /Al. And the best power conversion efficiency of device we got with NiO buffering layer is 2.49%, which is hundred times of ones without NiO buffering layer.
Authors: C. Sunseri, S. Piazza, F. Di Quarto
Authors: Claes Goran Granqvist, E. Avendaño, A. Azens
Authors: Yu Jun Zhang, Yuan Hua Lin, Ce Wen Nan
Abstract: Transition metal (TM) doped NiO is a promising candidate of p-type oxide diluted magnetic semiconductors (DMSs), which shows obvious room-temperature ferromagnetism. When researching the magnetic properties of DMSs, it is very important to get rid of ferromagnetic impurity phases by optimizing the preparation process. For this purpose, pure NiO thin films have been deposited by a pulsed laser deposition method and annealed by different annealing process. As-deposited or low-temperature annealed films show room-temperature ferromagnetism and high-temperature annealed films are not ferromagnetic. Nickel metal should be the origin of ferromagnetism in these thin films. On the other hand, high annealing temperature influences the microstructure of the film surface a lot. These results show a useful method to eliminate ferromagnetic impurity in NiO thin films and to optimize the preparation parameters of TM doped NiO thin films.
Authors: In Jun Hwang, Kang Min Lee, Bong Young Yoo, Dong Hyuk Shin
Abstract: Characterization of nickel oxide layers on the AZ91 Mg alloys by plasma electrolytic oxidation (PEO) was investigated. For this purpose, PEO coating was carried out on the present sample in the alkaline electrolyte with nickel ion at three different voltage responses, i.e., 150, 250, 350 V. The amount of nickel oxide increased by increasing process time, and changed the color of sample from light grey to moderate olive brown. It was observed from potentio-dynamic polarization analysis that polarization resistance of oxide layer was increased with increasing nickel ions. Also microhardness of the sample processed at 350 V was higher than those of the samples.
Authors: Claes Goran Granqvist
Abstract: Chromogenic materials and devices allow the construction of glazings whose throughput of visible light and solar energy can be varied depending on the application of an electrical voltage or temperature. These glazings are of much interest for energy efficient buildings and are able to create energy efficiency along with indoor comfort. This paper outlines the basics of electrochromic and thermochromic technologies with foci on functional principles, materials, device and manufacturing technology, and selected results from research and development.
Authors: Zbigniew Jurasz, Krzysztof Adamaszek, Romuald Janik, Zbigniew Grzesik, Stanisław Mrowec
Abstract: Detailed investigations of nonstoichiometry as well as chemical and self-diffusion in nickel oxide have shown that doubly ionised cation vacancies and electron holes are the predominant defects in this material. The present work is an attempt to demonstrate that aliovalent impurities (Cr, Al, Na and Li) may considerably influence the concentration of these defects and, consequently, the oxidation rate of nickel at high temperatures. It has been shown that small amounts of tri-valent impurities (Cr, Al) bring about an increase of the oxidation rate, while mono-valent ones (Li, Na) decrease the rate of oxidation. These phenomena may satisfactorily be explained in terms of a doping effect. All experiments have been carried out as a function of temperature (1373-1673 K) and oxygen pressure (1-105 Pa) and consequently, it was possible to determine the influence of impurities not only on the oxidation rate but also on the activation energy of reaction and its pressure dependence. The results of these investigations could again be elucidated in terms of doping effect.
Authors: Surat Futemvong, Atip Pengpad, Niyom Hongsith, Duangmanee Wongratanaphisan, Atcharawan Gardchareon, Supab Choopun
Abstract: ZnO dye-sensitized solar cells (ZnO DSSCs) with different thickness of NiO thin films coated in photo-electrode and counter-electrode were investigated. NiO thin films were prepared by thermal evaporation of NiO onto FTO glass substrate. The films were characterized by FE-SEM. For the photo-electrode, NiO thin films were coated on ZnO with 0.2, 0.6, 1.1 and 2.2 mg to form a barrier layer. For the counter-electrode, NiO thin films were coated on FTO glass with 5.4, 10.8, 16.2 and 21.6 mg in order to increase a surface-to-volume ratio. The photoconversion efficiency of ZnO DSSCs was measured under illumination of stimulated sunlight obtained from solar simulator with the radiant power of 100 mW/cm2. It was found that ZnO DSSCs coated with 0.6 mg NiO in photo-electrode and 10.8 mg in counter-electrode exhibited the highest photoconversion efficiency of 1.00% and 0.92%, respectively. The enhancement of photoconversion efficiency with NiO coating maybe explained by decreasing of charge recombination in photo-electrode and increasing of active surface area in counter-electrode.
Authors: Ying Yang, Jia Rui Cui, Peng Fei Yi, Xue Yi Guo
Abstract: In this work, a magnetic polymer electrolyte composed by agarose as polymer matrix, NMP as solvent and NiO/TiO2 mixed nanoparticles as modifier was investigated and employed in the solid-sate dye-sensitized solar cells (DSSCs). The influence of NiO/TiO2 mixed nanoparticles on the morphology and ionic conductivity of the polymer electrolyte was studied by SEM and electrochemical impedance spectra. From SEM analysis, the mixing of NiO with TiO2 nanoparticle in polymer electrolyte leads to smooth surface of the polymer electrolyte films. The polymer electrolyte modified by mixed nanoparticles with NiO: TiO2 ratio of 1:4 shows the maximum ionic conductivity of 6.64×10-3 S·cm-1. From photovoltaic performance study, the increase of NiO: TiO2 ratio in polymer electrolyte leads to an improvement in light-to-electric conversion efficiency. The optimal photoelectric efficiency is achieved at NiO: TiO2 ratio of 1: 4. Besides, after treatment under an external magnetic field, the DSSC modified with NiO: TiO2 ratio of 1: 4 exhibits a better photovoltaic performance than that of DSSC without magnetic field treatment.
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