Mechanism of Charge Transport in Anisotropic Layers of a Phthalocyanine Polymer
| Autor: | Martin Gurka, J. M. Warman, Dieter Neher, P. Gattinger, A. M. van de Craats, H. Rengel, Manfred Buck |
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| Rok vydání: | 1999 |
| Předmět: |
Materials science
Condensed matter physics Orders of magnitude (temperature) Analytical chemistry Institut für Physik und Astronomie Activation energy Dielectric Conductivity Surfaces Coatings and Films Electric field Materials Chemistry Charge carrier Physical and Theoretical Chemistry Anisotropy Ohmic contact |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp983734v |
| Popis: | Solid samples of phthalocyaninato-polysiloxanes (PcPS) have been analyzed by electrical dark conductivity experiments and by pulse-radiolysis time-resolved microwave conductivity (PR-TRMC) measurements. The in-plane conductivity of anisotropic PcPS Langmuir−Blodgett assemblies on gold surface-comb electrodes reveals an ohmic dependence at low voltages followed by a space-charge-limited current regime at higher electric fields. The conductivity displays a close to Arrhenius-type temperature dependence, with activation energies of 0.33−0.36 eV. The analysis of the space-charge limited currents (SCLC) experiments yields charge carrier mobilities of approximately 10-7−10-6 cm2/V-1 s-1 at room temperature. The conductivity perpendicular to the polymer chains was investigated by performing dielectric experiments on sandwich devices. These measurements reveal conductivities which are lower by several orders of magnitude than the corresponding in-plane values but the activation energy agrees quite well with that ... |
| Databáze: | OpenAIRE |
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