Investigation of electrical properties (ac and dc) of organic zinc phthalocyanine,ZnPc, semiconductor thin films |
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| Institution: | 1. Department of Physics, College of Science and Technology, Al-Quds University, P.O. Box 20002, Jerusalem, Palestine;2. Thin Films Laboratory, Department of Physics, Keele University, Keele, Staffordshire ST5 5BG, UK;1. Department of Physics, Jimei University, 361021, Xiamen, Fujian province, PR China;2. Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, PR China;3. Shanghai Astronomical Observatory, Chinese Academy of Sciences, 200030, Shanghai, PR China;4. Department of Physics, Shaoxing University, 312000, Shaoxing, Zhejiang province, PR China;1. Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK;2. Department of Physics, Faculty of Science, Babylon University, Babylon, Iraq;3. Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentiev Ave., Russia;4. Novosibirsk State University, Pirogova Str. 2, Russia;5. Gebze Technical University, Department of Chemistry, Gebze 41400, Kocaeli, Turkey;1. Material Science Laboratory, Department of Physics, Guru Nanak Dev University, Amritsar, Punjab, India;2. Centre for Sustainable Habitat, Guru Nanak Dev University, Amritsar, Punjab, India;1. Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, PL-50 383 Wroclaw, Poland;2. Department of X-ray Crystallography and Crystal Chemistry, Institute of General and Ecological Chemistry, Technical University Lodz, Zeromskiego 116, 90-924 Lodz, Poland;3. Faculty of Chemistry, Wroclaw University of Technology, Wybrzeze Wyspiańskiego 27, 50-370 Wroclaw, Poland |
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| Abstract: | We report measurements on the electrical properties of thermally evaporated zinc phthalocyanine, ZnPc, semiconductor thin films. Aluminum and gold metal electrodes were used and both proved to act as ohmic contacts. A relative permittivity, εr, of 1.56 was estimated from the dependence of capacitance on film thickness. The room temperature current density–voltage measurements indicated an ohmic conduction at low voltages, while a space–charge-limited conduction at higher voltages. An average value of a thermally generated hole concentration of the order 1013 m−3 was estimated at room temperature.The ac conductivity, capacitance and loss tangent were measured over a wide range of temperature (from 170 to 430 K) and frequency (between 0.1 and 20 kHz). The ac conductivity of ZnPc films was observed to be proportional to ωs, where ω is the angular frequency, and the index s is a temperature and frequency-dependent constant. At low temperatures and for higher frequencies the ac conduction was due to hopping. The capacitance, as well as the loss tangent, was found to be dependent on both temperature and frequency, but was constant for all frequencies at low temperatures. Such dependences were accounted for the equivalent-circuit model consisting of inherent capacitance in parallel with a temperature dependent resistive element. |
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