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

Published online by Cambridge University Press:  31 January 2011

H. R. Kerp ,
K. T. Westerduin ,
A. T. van Veen  and
E. E. van Faassen
H. R. Kerp
Affiliation:
Utrecht University, Debye Institute, Section Interface Physics, P.O. Box 80000, 3508 TA Utrecht, The Netherlands
K. T. Westerduin
Affiliation:
Interfaculty Reactor Institute, Reactor Physics Department, Mekelweg 15, 2629 JB Delft, The Netherlands
A. T. van Veen
Affiliation:
Interfaculty Reactor Institute, Reactor Physics Department, Mekelweg 15, 2629 JB Delft, The Netherlands
E. E. van Faassen
Affiliation:
Utrecht University, Debye Institute, Section Interface Physics, P.O. Box 80000, 3508 TA Utrecht, The Netherlands
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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.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 2 , February 2001 , pp. 503 - 511
Copyright
Copyright © Materials Research Society 2001

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