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  • 11
    Online Resource
    Online Resource
    Effect of the Precursor Solution Concentration of CuI Thin Film Deposited by Spin Coating Method
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 364 ( 2011-10), p. 417-421
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 364 ( 2011-10), p. 417-421
    Abstract: In this research, the effect of precursor concentration of CuI thin film deposited by spin coating method was studied. The wide band gap p-type semiconductor CuI thin film was prepared by mixing the CuI powder with 50 ml of acetonitrile as a solvent. The CuI concentration varies from 0.05M to 0.5M. The speed for spin coating is 1000 rpm for 60 seconds. After the deposition the CuI thin films were annealed at 150°C. The result shows the CuI thin film properties strongly depends on its precursor concentration. Thickness between 33.65 nm - 441.25 nm was obtained as the concentration increased. The increment of thickness affected the electrical property with resistivity of about 10 -6 Ω.cm and 10 1 Ω.cm was observed for all the CuI thin films. For optical properties, the transmittance decreased with high concentration as high amount of CuI particle were observed in the thin films. From the transmittance, the absorption coefficient of 10 -6 m -1 and optical band gap of 3.10 and 3.50 eV for all the films were observed using Tauc’s plot.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.364
    DOI: 10.4028/www.scientific.net/AMR.364.417
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
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  • 12
    Online Resource
    Online Resource
    Optical and Structural Properties of MEH-PPV: ZnO Nanocomposites
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 364 ( 2011-10), p. 124-128
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 364 ( 2011-10), p. 124-128
    Abstract: Thin films of conducting unsaturated polymer of red color poly [2-methoxy-5(2’-ethyl hexyloxy)-phenylene vinylene] (MEH-PPV) containing different weight percent of ZnO nanoparticles were deposited by spin coating techniques. The MEH-PPV: ZnO solutions were spin coated onto 2 × 2 cm glass substrates. The spun MEH-PPV: ZnO thin films were used for investigating the optical properties by using Ultraviolet-Visible Spectrometer (UV-Vis). The structural properties of the thin films were investigated by Scanning Electron Microscopy (SEM). For MEH-PPV: ZnO nanocomposites, the UV-Vis absorption bands increases and showing slight blue shift compared to the pure MEH-PPV. The optical bandgap of MEH-PPV: ZnO nanocomposites slightly decrease when the amount of ZnO nanoparticles increase. ZnO nanoparticles apparently no effect on conjugation segments of MEH-PPV. From the SEM images of MEH-PPV: ZnO nanocomposites, it can be seen that ZnO nanoparticles form agglomerated regions.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.364
    DOI: 10.4028/www.scientific.net/AMR.364.124
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
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  • 13
    Online Resource
    Online Resource
    Effect of Post-Deposition Annealing Process on the Resistive Switching Behaviour of TiO〈sub〉2〈/sub〉 Thin Films by Sol-Gel Method
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 925 ( 2014-4), p. 125-129
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 925 ( 2014-4), p. 125-129
    Abstract: The paper presents the memristive behaviour of spin-coated titania thin films on ITO substrate. The sample was annealed in air ambient at different annealing temperature and duration of 250 and 450 °C for 20 and 60 min. The effect of post-annealing process to the physical thickness and crystallinity of the films towards switching behaviour was studied. It was found that the thickness and crystallinity of the films increases as the post annealing process increases. Sample annealed at 250 °C for 20 min with thinner film showed better switching behaviour even though the sample is still in amorphous form. Thus, in our work, we believed that the crystallinity of the films does not affect the switching behaviour of the sample. The reliability of device performance was studied by repeating the measurement for three times.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.925
    DOI: 10.4028/www.scientific.net/AMR.925.125
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
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  • 14
    Online Resource
    Online Resource
    Role of Thickness towards the Optical and Electrical Properties of Photoactive Layer MEH-PPV: TiO〈sub〉2〈/sub〉 Nanocomposite Thin Films
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 832 ( 2013-11), p. 404-409
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 832 ( 2013-11), p. 404-409
    Abstract: In recent years, the research on organic solar cells systems based on nanocomposite containing conjugated polymers has lead to great attention with the aim or replacing conventional inorganic solar cells. This nanocomposite can be processed at lower cost, low weight and ease of synthesis with greater versatility than todays solar cell. In this study, we investigated the dependence of physical, optical and electrical properties on the thickness of MEH-PPV: TiO 2 nanocomposite thin films for organic solar cell application. It was found the optical properties of photo-active layer MEH-PPV: TiO 2 nanocomposite thin films improved with increasing its thickness however the electrical properties decreased. The absorption coefficients of photoactive layer are high in the visible region (400-600 nm) with optimum absorption region at 500 nm. The shift of absorption edge toward longer wavelength with increased of nanocomposite photoactive layer thickness due to narrowing band gap caused by the effects of electron-electron and electron-impurity scattering. In addition the study of illuminated current-voltage (I-V) characteristics revealed the increment of recombination process with increased of photoactive layer thicknesses. It was found such increased in resistivity from 136x10 3 to 1600x10 3 Ω.cm is closely related to the electric field and exciton dissociation which is decreased with increased photoactive thickness.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.832
    DOI: 10.4028/www.scientific.net/AMR.832.404
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 15
    Online Resource
    Online Resource
    Optical Band Gap Decrement of Nanocomposited MEH-PPV:CNTs Thin Film for Organic Solar Cells
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 667 ( 2013-3), p. 260-264
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 667 ( 2013-3), p. 260-264
    Abstract: This work focus on optical band gap of nanocomposited MEH-PPV:CNTs thin film. In this research we investigate the behavior of optical band gap when the composition of CNTs powder is increased which directly influence the thickness of the thin film. The experimental process entailed for the black powder of CNTs to be first annealed at 450 °C before mixing it with the polymer solution to ensure that the impurities in the CNTs are all removed. The 20 mg MEH-PPV polymer was dissolved in an aromatic solvent which is toluene with a concentration of 1:1. The composite materials were prepared by adding appropriate amounts of CNTs powder (1, 2, 3 and 4 wt%) into the polymer solution to make various ratios of CNTs powder/polymer composites. The optical properties of the thin film were analyzed by using Perkin Elmer Lambda 750 UV/Vis Spectrometer. Thickness of the thin film is measured using Surface profiler Veeco Dektak 150. In this paper, the optical band gap energy is derived by assuming a direct transition of electron between the edge of the valence band and the conduction band. Our results demonstrates that as the thickness decrease from 62, 60, 59, 58 and 57 nm, the optical band gap showed slight decrement from 2.07, 2.07, 2.05, 2.01 and 2.00 eV for respectively.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.667
    DOI: 10.4028/www.scientific.net/AMR.667.260
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 16
    Online Resource
    Online Resource
    Raman and Electrical Analysis of Iodine-Doped Amorphous Carbon Thin Films
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 667 ( 2013-3), p. 281-286
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 667 ( 2013-3), p. 281-286
    Abstract: Iodine doped amorphous carbon (a-C: I) thin films were prepared by using Thermal Chemical Vapor Deposition (CVD) with deposition temperature ranging from 5000C to 7000C. The physical and electrical properties of deposited a-C:I thin films were characterized by Raman spectroscope and Solar Simulator system. The presence of 2 peaks known as Raman D peaks and Raman G peaks ensure the amorphous structure of carbon (C). As deposition temperature increase, the ID/IG ratio shows difference value, which indicates the effects of the temperature towards the a-C: I structures. An ohmic graph was obtained for the IV measurement, and the conductivity varies from 10-4 to 101 Scm-1. The photoresponse was also determined for all samples. As a reference, an undoped a-C thin film was prepared to differentiate the characteristic between a-C and a-C: I.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.667
    DOI: 10.4028/www.scientific.net/AMR.667.281
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 17
    Online Resource
    Online Resource
    Synthesis and Characterization of Carbon Nanotubes from Palm Oil by Aerosol-Assisted CVD
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 667 ( 2013-3), p. 218-223
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 667 ( 2013-3), p. 218-223
    Abstract: This paper will report on the synthesis of bundles of aligned single wall carbon nanotubes (SWCNTs) and multiwall carbon nanotubes (MWCNTs) from palm oil precursor and ferrocene as catalyst source by two stage aerosol-assisted CVD system at various deposition temperature ranging from 700-900oC. Palm oil was pyrolised into the furnace which contained the catalyst source producing black substances at the wall of the reaction furnace which were then collected to be characterized. Field emission scanning electron microscopy equipped with energy dispersive X-ray was used to obtain weight percentage, identification of samples and image of CNTs which showed different structures and diameters of CNTs relative to the deposition temperature of furnace. Raman Spectroscopy was used to further study the quality and identification of samples and finally X-ray powder diffraction was used to determine the crystalinity of samples. Individual micrograph of MWNTs at optimized deposition temperature was also obtained from the high resolution transmission electron microscopy.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.667
    DOI: 10.4028/www.scientific.net/AMR.667.218
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 18
    Online Resource
    Online Resource
    Transmittance Enhanced Properties of Novel Encapsulated ITO/Arc-TiO〈sub〉2〈/sub〉 Antireflective TCO Substrate Prepared by RF Magnetron Sputtering
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 667 ( 2013-3), p. 573-582
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 667 ( 2013-3), p. 573-582
    Abstract: In this work, a thermally stable multilayered transparent conducting oxide (TCO) utilizing TiO2 antireflection thin film (arc-TiO2) encapsulated under indium tin oxide (ITO) glass has been prepared by RF magnetron sputtering. The novel tri-functional conducting substrate with blocking layer capabilities has been designed via step-down interference coating structure of double layer antireflection coating (DLAR). The mixed-oriented type between the strongest ITO peak at (222) and a weak TiO2 peaks at (101) orientations have been observed under XRD analysis. The antireflection properties of double-layer ITO/arc-TiO2 is evidence with the existence of two maximum peaks around 410 nm and 750 nm. While, the corresponding reduction in reflectance of about 8% and 2% compared to bare ITO was achieved. The ITO/arc-TiO2 blocking layers conserves the low resistivity of ITO at 2.05 x 10-4 Ω cm, even after oxidizing during air annealing process above 400 °C. These results demonstrate that the multilayered ITO/arc-TiO2 with tailored refractive index by means of annealing treatment is a promising approach to realize a substrate which (a): electrically and thermally stable against processing temperature, (b): sustains the higher transmittance of the substrate even there is increase in total substrate thickness and (c): prevents electron recombination process occurring at the interface between the redox electrolytes and the TCO surface. The stable properties are found to be beneficial for use as TCOs in DSSCs.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.667
    DOI: 10.4028/www.scientific.net/AMR.667.573
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 19
    Online Resource
    Online Resource
    Surface Morphology of Seeded Nanostructured ZnO on Silicon by Sol-Gel Technique
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 667 ( 2013-3), p. 265-271
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 667 ( 2013-3), p. 265-271
    Abstract: Nanostructured ZnO as a seeded was prepared by sol-gel technique on p-type silicon in various low molarities. Zinc acetate, Diethanolamine (DEA), and isopropyl were use as starting material, stabilizer, and solvent respectively. Atomic Force Microscopy (AFM) analysis shows smooth surface and uniform layer were produced in low molarities of precursor. The surface morphology of nanostructured ZnO was analyzed by Field Emission Scanning Electron Microscopic (FESEM). It is found that the nanostructured ZnO were successfully deposited on the silicon substrate with size ~10 nm to ~35 nm. Photoluminescence spectroscopy was employed to study the band gap in room temperature. It shows that very low intensity of PL in 0.05m and 0.1 m. PL intensity become more obvious starting from 0.15 m of precursor concentration.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.667
    DOI: 10.4028/www.scientific.net/AMR.667.265
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 20
    Online Resource
    Online Resource
    Structural and Optical Properties of Nanohybrid PMMA/TiO〈sub〉2〈/sub〉
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 667 ( 2013-3), p. 63-67
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 667 ( 2013-3), p. 63-67
    Abstract: Preparation of nanohybrid PMMA/TiO2 hybrid was reported by using mixture sol-gel spin coating method. This studied involve modification band gap of TiO2 at different molar concentration of TTiB precursor. AFM image show TiO2 particles encapsulated with PMMA matrix. From UV-Vis spectroscope, we have found as increase of TTiB precursor molar concentration, optical band gap is 3.34 eV, increase in UV-range from 3.25 eV. This study suggested for improvement of optical band gap TiO2 coated glass.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.667
    DOI: 10.4028/www.scientific.net/AMR.667.63
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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