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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of N,N′-dimethyl-3,4,9,10- perylenetetracarboxylic acid diimide and phthalocyaninatozinc(ii) in electrochemical photovoltaic cells (1997)
    Springer
    Journal of applied electrochemistry 27 (1997), S. 1172-1178 
    Details
    ISSN: 1572-8838
    Keywords: photovoltaic cells ; photoelectrochemical cells ; vapour-deposited electrodes ; PcZn thin films ; MePTCDI thin films ; electrode kinetics ; adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract As a direct comparison to all-solid state photovoltaic cells, photoelectrochemical cells consisting of n-type N,N′-dimethyl-3,4,9,10-perylenetetracarboxylic acid diimide (MePTCDI) and p-type phthalocyaninatozinc(ii) (PcZn) thin film electrodes vapour-deposited onto ITO have been investigated in aqueous ferri/ferrocyanide, p-benzoquinone/hydroquinone or I3−/I− electrolytes. The ferri/ferrocyanide cell has been studied in more detail, and the results are discussed with regard to the HOMO-, LUMO- and Fermi-energies of the materials used. A setup of the electrodes in a tandem cell could increase the efficiency of the cell due to improved light harvesting. Saturation of the photocurrent with increasing ferri/ferrocyanide electrolyte concentration at single PcZn or MePTCDI electrodes is discussed using a model of reactant adsorption prior to the charge transfer step. In addition, a decrease observed for the open-circuit voltage of the entire cell with increasing ferri/ferrocyanide concentration leads to an optimum concentration of 10−3 moldm−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018467516812
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of central metal and ligand system on conduction type and charge carrier transport in phthalocyanine thin films (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 239-244 
    Details
    ISSN: 1057-9257
    Keywords: molecular semiconductors ; organic semiconductors ; phthalocyanines ; conductivity ; thermopower ; seebeck effect ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: By changing the chemical composition of phthalocyanine molecules, the electrical properties of the ensemble in the solid state can be influenced directly. This is shown for phthalocyaninatomanganese (PcMn) as compared with purely divalent central metals and for complexes in which the ligand system has been modified by either electron-withdrawing heteroatoms such as N instead of CH leading to tetrapyridotetraazaporphyrinatozinc (TPyTAPZn) or substituents such as F instead of H leading to hexadecafluorophthalocyaninatozinc (F16PcZn). The accessibility of additional oxidation states of Mn or the stabilisation of frontier orbital states by the ligand leads to a lower ionisation potential and interactions with impurities or dopant molecules are changed. A change in the observed majority carrier (n-type behaviour) is seen even under UHV conditions. Measurements of the thermoelectric power and electrical conductivity are presented of the pure films and after exposure to oxidising ambient. During film growth either island growth or a growth following the Stranski-Krastanov mechanism was observed. The comparison of the temperature dependence of thermopower and electrical conductivity leads to a discussion of the type of majority carriers, their generation as well as their transportation. For the materials investigated in this study the band model fails to explain the observed properties and a localised transport mechanism has to be considered. A transport in localised states close to the Fermi edge is discussed for TPyTAPZn and F16PcZn.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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