Thermal Analysis, Dielectric Response and Electrical Conductivity of Silicon Phthalocyanine Dichloride (SiPcCl 2 ) Thin
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https://doi.org/10.1007/s11664-020-08604-x 2021 The Minerals, Metals & Materials Society
ORIGINAL RESEARCH ARTICLE
Thermal Analysis, Dielectric Response and Electrical Conductivity of Silicon Phthalocyanine Dichloride (SiPcCl2) Thin Films MOHAMED ABD-EL SALAM,1 H.M. EL-MALLAH,2 D.G. EL-DAMHOGI ,2,4 and E. ELESH3 1.—Department of Physics, Faculty of Science, University of Suez Canal, Ismailia 41522, Egypt. 2.—Department of Physics and Mathematical Engineering, Faculty of Engineering, University of Port Said, Port Fouad 42526, Egypt. 3.—Department of Physics, Faculty of Science, University of Port Said, Port Said 42522, Egypt. 4.—e-mail: [email protected]
This research is a detailed examination of the effect of post-annealing on the structure and electrical conductivity of silicon phthalocyanine dichloride (SiPcCl2) thin films. Differential thermal analysis (DTA) is used to determine the temperature limit of thermal stability for a sample of silicon phthalocyanine dichloride (SiPcCl2). The results of differential thermal analysis (DTA) proved that silicon phthalocyanine dichloride (SiPcCl2) is thermally stable up to 415 K. The dielectric behavior and the electrical conductivity of silicon phthalocyanine dichloride (SiPcCl2) thin films were investigated under a temperature effect from 303 K to 383 K and a frequency from 200 Hz to 20 MHz. The frequency and temperature dependence of dielectric loss and dielectric constant values were explained in terms of dielectric polarization theory. The alternating current (AC) conductivity response toward the frequency change obeys Jonscher’s power law. The correlated barrier hopping (CBH) model is utilized and adapted to fit the conduction mechanism in the high- and low-frequency regions. Both the complex electric modulus and the impedance formalisms are used to illustrate the dielectric characteristics of the silicon phthalocyanine dichloride (SiPcCl2). The potential height value of the hopping barrier, Wm, and activation energy value, Eac, for dielectric relaxation were determined. Key words: Silicon phthalocyanine dichloride (SiPcCl2), thermal analysis, electrical conductivity
INTRODUCTION In the last century, organic materials have been extensively used in the fabrication of various photonic and electronic devices.1 Some advantages of organic compounds are flexibility in the synthesis methods, some unique properties by substitution of functional groups, and a high nonlinearity.2 Organic semiconductor thin films provide high production of efficient and low-cost different applications3
(Received August 3, 2020; accepted November 3, 2020)
including thin film transistors,4–6 photovoltaic and organic light-emitting diodes cells,7,8 (OLED).9–12 Phthalocyanines (Pcs) is a large family of heterocyclic conjugated compounds with strong chemical stability. These characteristics make phthalocyanines (PCs) a significant structural material that can be utilized in many applications such as systems of optical data storage,13 gas sensors,14,15 and switching devices.16 The study of
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