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Quantification and effects of molecular oxygen and water in zinc phthalocyanine layers

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Abstract

Gas effusion measurements on zinc phthalocyanine (ZnPc) layers showed the presence of a significant amount of oxygen and water inside the material during exposure to ambient conditions. Of both species the bulk concentration lay in the range of 1020 molecules per cm3. Temperature-dependent analysis indicated that at 296 K all O2 molecules, and roughly one half of the H2O molecules, were mobilized and diffused with diffusion coefficients DO2 of 3 ∗ 10−8 cm2/s and DH2O of 1.3 ∗ 10−10 cm2/s. Electrical analysis of ZnPc layers in controlled atmospheres revealed that the electrical properties of the bulk were determined by O2, whereas H2O influences the surface conductivity. A space-charge density of (1.6 ± 0.2) ∗ 1016 O2 − ions per cm3 was measured in atmospheric conditions.

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Authors and Affiliations

  1. Utrecht University, Debye Institute, Section Interface Physics, P.O. Box 80000, 3508 TA, Utrecht, The Netherlands

    H. R. Kerp & E. E. van Faassen

  2. Interfaculty Reactor Institute, Reactor Physics Department, Mekelweg 15, 2629 JB, Delft, The Netherlands

    K. T. Westerduin & A. T. van Veen

Authors
  1. H. R. Kerp
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  2. K. T. Westerduin
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  3. A. T. van Veen
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  4. E. E. van Faassen
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Kerp, H.R., Westerduin, K.T., van Veen, A.T. et al. Quantification and effects of molecular oxygen and water in zinc phthalocyanine layers. Journal of Materials Research 16, 503–511 (2001). https://doi.org/10.1557/JMR.2001.0073

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  • DOI: https://doi.org/10.1557/JMR.2001.0073

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