Papers by Keyword: Solution Process

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Authors: Yuh Chung Hu, David T.W. Lin, Hai Lin Lee, Pei Zen Chang
Abstract: The effect of Zinc-Oxide (ZnO) thin film annealed in different ambiences is presented. To achieve low cost and environmentally friendly process, ZnO aqueous solution is synthesized by dissolving zinc acetate dihydrate in deionized water directly. Zinc oxide aqueous solution of high solubility and stability is presented. High quality and dense Zinc oxide thin film is formed by spin coating. Annealing temperatures are in the range of 300 °C~500 °C, and annealing ambiences of both air and N2 are discussed.
Authors: Nan Liu Liu, Hong Yu Zhen, Wei Xu
Abstract: High efficient white polymer light-emitting diodes (WPLEDs) were fabricated with blue- fluorescent polymers(PFO) and yellow- phosphorescent polymers(PFCz2-NPYIrm5) blending as light emitting layer, and a water/alcohol-soluble polymer poly [(9,9-bis(3′-((N,N-dimethyl)-N-ethylammonium)propyl)-2,7-fluorene)-2,7-(9,9-dioctylfluorene) - 4,7-(2,1,3- benzoselenadiazole)]dibromide(PFN) as electron injection layer. The structure of the devices used here is: ITO/PEDOT-PSS(40nm)/PVK(30nm)/PFO: PFCz2-NPYIrm5 (60nm)/PFN(20nm)/Ba(4nm)/Al(120nm). When the doping concentration of PFCz2-NPYIrm5 was 1% and PFN film thickness was about 20nm, the EL emissions from the host and the guests were observed simultaneously and the efficient white light emission with coordinates of (0.34,0.32) was achieved. A maximum external quantum efficiency of 4.8% and luminous efficiency of 6.6cd/A was obtained at 8.5V.
Authors: Qian Li, Xi Feng Li
Abstract: The effects of after-annealed temperature on the microstructure, optical and electrical properties of solution processed amorphous indium gallium zinc oxide (a-IGZO) thin films were investigated in this article. The X-ray diffraction results confirmed that all the films were an amorphous structure. A transmittance of more than 90% in the visible wavelength region was obtained. the a-IGZO thin films reached the lowest electrical resistivity of 9.44×104Ω•cm with the after-annealed temperature of 300°C.
Authors: Ji Whan Ahn, Hyun Seo Park, Jeong Hwan Kim, Sun Hee Cheong, Jeong Ah Kim
Abstract: In this study, single phase aragonite PCC was synthesized by the solution process using Ca(OH)2 slurry and Na2CO3 solution as the main reactants. To begin with, the formation behavior of PCC polymorphs following changes in supersaturation was investigated, and the optimum synthetic condition of single-phase aragonite PCC was clarified after the role of NaOH in the reaction system was reviewed. In the results, it was considered that lower supersaturation was necessary to obtain a single phase aragonite; and, since the solubility of Ca(OH)2 was decreased with the addition of NaOH by a common ion effect, it is possible to perform a experiment at a lower Ca2+ concentration. In conclusion, in the case of the reaction of the 2.5M NaOH solution, single phase aragonite was obtained. Furthermore, NaOH solution was produced as a by-product in the solution process by reacting Ca(OH)2 slurry with Na2CO3. Thus, recycling of the NaOH solution was attempted in order to clear the environmental issue. It is difficult to recycle directly since the NaOH solution was diluted during the experiment. The optimum condition was investigated by control of experimental factors such as the concentration of Ca(OH)2, Na2CO3 and NaOH, and the reaction temperature, after which the NaOH solution was recycled without re-treatment. The formation characteristics of aragonite PCC, such as formation yield, particle morphology and aspect ratio, were investigated.
Authors: Hajime Wagata, Naoki Ohashi, Ken Ichi Katsumata, Kiyoshi Okada, Nobuhiro Matsushita
Abstract: ZnO films with controlled microstructures and crystal orientations were fabricated on nonseeded substrates by a spin-spray method employing tri-sodium citrate as a structure-directing agent at 90°C. The microstructure of the films changed from a rod array to a dense film by addition of the tri-sodium citrate in the solution. The FT-IR spectra of the films prepared with citrate contained organic molecules including carboxyl groups, being attributed to citric ion. Surface analysis by XPS indicated that the adsorbed citric ions were estimated to form zinc-citrate complex including ammonium ion or ammonium citrate.
Authors: Nan Liu Liu, Wei Xu
Abstract: Ultra-long highly ordered organic nanowires arrays were in situ self-assembled directly on the silicon substrate over a large area based on solution process. The location and the orientation of the nanowires arrays can be easily tuned and controlled by optimizing the motion of the substrate and the solvent evaporation rate during dip-coating process. By precisely adjusting the motion of the substrate, the length limits for nanowires in array caused by the sticking-slipping motion of the contact line in a concentrated solution have been successfully broken through. The longest nanowires array with a length of around 1000µm was obtained from concentrated solution.
Authors: Seung Rok Lee, Si Nae Heo, M.S. Anwar, Ahmed Faheem, Bon Heun Koo
Abstract: In this research, ZnO nanorods were fabricated on the polymer substrate using a hydrothermal process. The grown nanorods were characterized by x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Raman measurements. ZnO nanorod arrays have been fabricated with diameter of 30-50 nm, and highly c-axis oriented with hexagonal wurtzite structure and perpendicular to the substrate with high crystalline quality. Room temperature Raman measurements exhibit high intensity E2 high mode and low intensity defect related mode.
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