Document Details
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Document Type |
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Thesis |
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Document Title |
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Electrical investigations of ZnO/CuO heterojunction diode prepared via spray pyrolysis technique دراسة الخصائص الكهربائية لوصلة ثنائية غير متجانسة من CuO / ZnO محضرة بواسطة تقنية الرذاذ المائي الحراري |
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Subject |
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Faculty of Science |
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Document Language |
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Arabic |
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Abstract |
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In the present study, we have deposited sets of CuO, ZnO thin films and ZnO/CuO heterojunctions by a spray pyrolysis technique (SP).
Firstly, we have investigated the influence of the substrate temperature and molar concentration, on CuO thin film properties and the effect of substrate temperature, on ZnO thin film properties. The structure and morphology of the synthesized films were characterized by means of XRD (X-ray diffraction), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The optical properties were analyzed using UV–visible spectroscopy. The obtained results indicate that the substrate temperature is a key parameter controlling the growth mechanisms of CuO and ZnO films, as well as their structural, optical and morphological properties. At the end of this section, we inferred that 0.1M at 400 oC preparation conditions are the optimal ones, leading to high performances of ZnO/CuO heterojunction.
In the second part of this work, we have studied the impact of the two semiconductor layers deposition order, and delaying time between their deposition, on the electrical properties of ZnO/CuO heterojunction. The prepared ZnO/CuO heterojunctions characteristics were analyzed by means of a Semiconductor Characterization System, in order to determine their electrical properties. The obtained results reveal the strong influence of the two semiconductor layers order, and the time taken between their depositions on the electrical properties of the realized ZnO/CuO heterojunction. We concluded that the device prepared with a successive deposition of CuO on ZnO exhibits the highest performance due to the low formed density of states Nss about of 106 eV.cm-2. The best achieved I-V characteristic is a low reverse current density (J) around 1.4x 10-10 A/cm2.
Keywords: heterojunction, spray pyrolysis, thin films, CuO, ZnO, structural properties, optical properties, electrical properties, solar cell. |
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Supervisor |
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Prof. Dr. Mohammed Salah Aida |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1444 AH
2022 AD |
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Co-Supervisor |
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Dr. Ahmed Obaid Alzahrani |
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Added Date |
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Monday, February 27, 2023 |
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Researchers
| سالم ظافر الغامدي | Alghamdi, Salem Dhafer | Researcher | Master | |
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