Impedance Spectroscopy and Dielectric Relaxation in Phthalocyanine Thin Film

Yıl 2017, Cilt: 22 Sayı: 3, 145 - 152, 28.12.2017

Nursel Can Ahmet Altındal

https://doi.org/10.17482/uumfd.372447

Öz

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 ω^m,
where the index m is
found strongly temperature dependent,
was observed for the ac conductivity σ_ac. 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.

 

Anahtar Kelimeler

Phthalocyanine, Impedance, Relaxation, Ac conductivity, CBH model

FTALOSIYANIN İNCE FILMDE EMPEDANS SPEKTROSKOPI VE DIELEKTRIK DURULMA

Öz

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 ω^m
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

Kaynakça

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