Synthesis and effects of substrate temperature on ac and dc electrical properties of cobalt phthalocyanine (CoPc) thin films

Aki F. N., Doǧan D., DUMLUDAĞ F., Altındal A., Bulut M., Bekaroǧlu Ö.

6TH International Conference of the Balkan Physical Union, İstanbul, Turkey, 22 August 2006 - 26 August 2007, vol.899, pp.229-230 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 899
  • Doi Number: 10.1063/1.2733120
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.229-230
  • Keywords: Ac conductivity, Cobalt phthalocyanine, Correlated barrier hopping, Dc conductivity
  • Istanbul Technical University Affiliated: Yes


In this study, 4,4′,4″-[benzene-1,3,5-tryltris(oxy)]tri-9,10, 16,17,23,24-hexa(hexylthio)phthalocyaninatocobalt(II) has been synthesized from 4-[3,5-bis(3,4-dicyano phenoxy)phenoxy]phthalonitrile and 4,5- bishexylthiophthalonitrile with CoCl2.6H2O in ethylene glycol at 170-180°C for 6 hours. The effects of substrate temperature (during coating of the films) on the electrical characteristics were investigated. CoPc thin films were prepared by cast coating method at the substrate temperatures of 298, 348, 373, 398 K on interdigital gold electrodes on glass substrate. The dc and ac electrical properties of CoPc films were investigated in the temperature range of 298 - 391 K in dark. The ac electrical properties of CoPc films have been studied in the frequency range from 40 Hz to 100 kHz. All measurements were performed under N2 flow. The temperature dependence of dc conductivity show typical Arrehenius behavior for all films. As the substrate temperature increases during coating of the films from 298 K to 398 K, the activation energy decreases from 1.04 to 0.96 eV. The ac conductivity of the films is represented by the form ωs. The temperature dependency of frequency exponent s on temperature suggests a correlated barrier hopping (CBH). © 2007 American Institute of Physics.