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    Hole doping through indium intercalation into copper phthalocyanine
    (2013-10-29)
    Jaruvanawat, Anuchit
    ;
    Prajuabwan, Pakorn
    ;
    Rojanasuwan, Sunit
    ;
    Chanhom, Annop
    ;
    Rangkasikorn, Adirek
    A blend of molecular acceptor and molecular donor made of Copper Phthalocyanine (CuPc) and Indium in various ratios were evaporated in high vacuum on to intrinsic silicon substrates by using vacuum thermal co-evaporation technique. Electronic properties of In-doped CuPc thin films have been examined by X-ray photoelectron spectroscopy (XPS). The results obtained by XPS suggests that In-doped CuPc is a hole transport material. © (2013) Trans Tech Publications, Switzerland.
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    Electrical bistable properties of copper phthalocyanine at different deposition rates
    (2012-06-01)
    Onlaor, K.
    ;
    Tunhoo, B.
    ;
    Keeratithiwakorn, P.
    ;
    Thiwawong, T.
    ;
    Nukeaw, J.
    Organic bistable memory device is a next-generation of the electrical memory unit. In this paper, we report about the influence of structural properties on electrical bistable behavior of copper phthalocyanine organic memory device. Copper phthalocyanine (CuPc) layer was prepared by thermal evaporation technique at different deposition rates. When the deposition rate is increased, the film crystalline decreases and the surface morphology gradually changes from large flat grain to fine grain structure. Structural parameters such as the crystalline size of CuPc films and dislocation density can be calculated from XRD spectra. Moreover, the effect of deposition rate of CuPC layer on the bistable properties can be performed by current-voltage characteristics, retention measurement, impedance spectroscopy and temperature dependence measurement. The conduction mechanism in both ON and OFF states of the bistable device was analyzed by theoretical model, which can be proposed as a possible trap center of the carrier trapping and de-trapping process by structural defects in CuPc layer. Furthermore, the reliability issue such as cycling endurance and data retention is presented. © 2012 Elsevier Ltd. All rights reserved.
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    TiO2/CuPc hybrid nanocomposites prepared by low-energy ball milling for dye-sensitized solar cell application
    (2010-09-15)
    Mekprasart, W.
    ;
    Jarernboon, W.
    ;
    Pecharapa, W.
    The hybrid nanocomposites of titanium dioxide nanoparticle (TNP) and copper phthalocyanine (CuPc) were successfully synthesized by low-energy ball milling as a main part of synthesis and processing via three different methods without additional heating. Structural properties of as-prepared composites were well characterized by X-ray diffraction, Raman spectroscopy, Field Emission-Scanning Electron Microscopy and Transmission Electron Microscopy. TNP/CuPc hybrid nanocomposites acting as photocatalyst were used as a modified working electrode materials in dye-sensitized solar cells. Among all prepared conditions, the composite with 0.05 wt.% CuPc prepared by homogenization and ball milling process exhibited the best performance with optimized solar energy conversion efficiency of 1.24% with fill factor of 0.45. The significant enhancement of current density of the device may be associated to the decrease of recombination of photo-injected electrons and reduction of charge transfer resistances at the interface caused by the presence of CuPc on TNP matrix. © 2010 Elsevier B.V. All rights reserved.
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