FTALOSIYANIN İNCE FILMDE EMPEDANS SPEKTROSKOPI VE DIELEKTRIK DURULMA

Döndürerek kaplama yöntemiyle hazırlanan top tipi çinko (II) ftalosiyanin ince filmlerin dielektrik durulma davranışları 5 Hz. ile 13x106 Hz frekans aralığında sıcaklığa bağlı olarak (298 K – 468 K sıcaklık aralığında) empedans spektroskopi yöntemiyle incelenmiştir. Elde edilen verilerin modellenmesinde sistemin dielektrik davranışının paralel RC eşdeğer devre ile temsil edilebileceği görülmüştür. Filmlerde ac iletkenliğin frekansa bağlılığının ωm şeklinde olduğu ve frekansın üssü olan m parametresinin kuvvetle sıcaklığa bağlı olduğu gözlemlenmiştir. Deneysel olarak elde edilen ac iletkenlik verileri iki farklı model kullanılarak analiz edilmiştir. Frekansın üssü olan m parametresinin sıcaklığa bağlılığının incelenmesinde çinko (II) ftalosiyanin ince filmlerde ac yük iletiminin hoplama mekanizması sayesinde gerçekleştiği sonucuna varılmıştır.

Anahtar Kelimeler:

Ftalosiyanin, Empedans, Durulma, Ac iletkenlik, CBH model

Impedance Spectroscopy and Dielectric Relaxation in Phthalocyanine Thin Film

Dielectric relaxation behavior of spin coated thin film of novel ball-type binuclear zinc(II) phthalocyanine were studied using impedance spectroscopy technique over a frequency range of 5–13x106 Hz and temperatures (298 – 468 K). Simulation of the obtained impedance data indicated that the dielectric behaviour of the system can be modeled by a parallel RC electrical equivalent circuit. A frequency dependence in the form of ωm, where the index m is found strongly temperature dependent, was observed for the ac conductivity σac. Ac conductivity data were analyzed in terms two different models. The observed temperature dependence of the m indicate that the ac charge transport in Pc film take place via hopping process.

Keywords:

Phthalocyanine, Impedance, Relaxation, Ac conductivity, CBH model,

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Altındal, A. Abdurrahmanoğlu, Ş. Bulut, M. Bekaroğlu, Ö. (2005) Charge transport mechanism in bis(double-decker lutetium(III) phthalocyanine) (Lu2Pc4) thin film. Synthetic Metals, 150, 181–187. doi: 10.1016/j.synthmet.2005.02.006
Altındal, A. Kurt, Ö. Şengül, A. Bekaroğlu, Ö. (2014) Kinetics of CO2 adsorption on ball-type dicopper phthalocyaninethin film. Sensors and Actuators B, 202, 373–381. doi: 10.1016/j.snb.2014.05.107
Anthopoulos, T.D. Shafai, T.S. (2003) Electrical properties of a-nickel phthalocyanine/aluminium interfaces: effects of oxygen doping and thermal annealing. Journal of Physics and Chemistry of Solids, 64, 1217–1223. doi: 10.1016/S0022-3697(03)00062-3
Bao, Z. Lovinger, A.J. Dodabalapur, A. (1996) Organic field‐effect transistors with high mobility based on copper phthalocyanine. Appl. Phys. Lett., 69(20), 3066-3068. doi: 10.1063/1.116841
Ceyhan, T. Altındal, A. Erbil, M.K. Bekaroğlu, Ö. (2006) Synthesis, characterization, conduction and gas sensing properties of novel multinuclear metallo phthalocyanines (Zn, Co) with alkylthio substituents. Polyhedron, 25, 737–746. doi: 10.1016/j.poly.2005.07.046
Ceyhan, T. Altındal, A. Özkaya, A.R. Çelikbıcak, Ö. Salih, B. Kemal Erbil, M. Bekaroğlu, Ö.( 2007) Synthesis, characterization and electrochemical properties of novel metal free and zinc(II) phthalocyanines of ball and clamshell types. Polyhedron, 26, 4239–4249. doi: 10.1016/j.poly.2007.05.028
Eliot, S.R. (1977) A theory of a.c. conduction in chalcogenide glasses. Philos. Mag., 36 (6), 1291-1304. doi: 10.1080/14786437708238517
Garcia-Belmonte, G. Boix, P.P. Bisquert, J. Sessolo, M. Bolink, H.J. (2010) Simultaneous determination of carrier lifetime and electron density- of-states in P3HT:PCBM organic solar cells under illumination by impedance spectroscopy. Solar Energy Materials & Solar Cells, 94, 366–375. doi: 10.1016/j.solmat.2009.10.015
Jonscher, A.K. (1983) Dielectric Relaxation in Solids. Chelsea Dielectric Press, London
Khrishnakumar, K.P. Menon, C.S. (2001) Determination of the thermal activation energy and grain size of iron phthalocyanine thin films. Materials Letters, 48(2001), 64–73. doi: 10.1016/S0167-577X(00)00281-0
Kimura, M. Horai, T. Hanabusa, K. Shirai, H. (1997) Electrochromic polymer derived from oxidized tetrakis(2-hydroxyphenoxy)phthalocyaninatocobalt(II) complex. Chem. Lett., 7, 653-654. doi: 10.1246/cl.1997.653
Kumar, A. Murari, N.M. Katiyar, R.S. (2009) Investigation of dielectric and electrical behavior in Pb(Fe0.66 W0.33)0.50Ti0.50O3 thin films by impedance spectroscopy.J. Alloys. Compd., 469, 433–440. doi: 10.1016/j.jallcom.2008.01.130
Leon, C. Lucıa, M.L. Santamarıa, J. (1997) Correlated ion hopping in single-crystal yttria-stabilized zirconia. Phys. Rev. B., 55, 882-887. doi: 10.1103/PhysRevB.55.882
MacDonald,J.R. (1987) Impedance Spectroscopy: Emphasizing Solid Materials and Systems, Wiley-Interscience, New York
Manaka, T. Iwamoto, M. (2003) Electrical properties of unsubstitutedyfluorine-substituted phthalocyanine interface investigated by Kelvin probe method. Thin Solid Films, 438–439, 157–161. doi: 10.1016/S0040-6090(03)00726-0
Pandey, R. Zou, Y. Holmes, R.J. (2012) Efficient, bulk heterojunction organic photovoltaic cells based on boron subphthalocyanine chloride-C70. Applied Physics Letters, 101, 033308-1-033308-4. doi: 10.1063/1.4737902
Piasecki, T. Nitsch, K. (2010) Study of sprayed coatings and compound materials by impedance spectroscopy. Surface & Coatings Technology, 205, 1009-1014. doi: 10.1016/j.surfcoat.2010.07.074
Shafai, T.S. Anthopoulos, T.D. (2001) Junction properties of nickel phthalocyanine thin film devices utilising indium injecting electrodes. Thin Solid Films, 398–399, 361–367. doi: 10.1016/S0040-6090(01)01345-1
Shan Do, J. Jen Chen, P. (2007) Amperometric sensor array for NOx, CO, O2 and SO2 detection. Sensors and Actuators B., 122, 165–173. doi: 10.1016/j.snb.2006.05.030
Vidadi, Y.A. Rozenshtein, L.D. Chistyakov, E.A. (1969) Hopping and band conductivities in organic semiconductors. Sov. Phys. Solid State, 11, 173-175.
Waclawek, W. Kulesza, M. Zabkowska, M. (1981) Mater. Sci. (Poland), 7, No:2-3, 385.