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Abstract <p>The present work is focused on the preparation of thin films of cadmium oxide doped with two percentages of aluminum, which are 1 and 3%, prepared by the pyrolysis technique. The prepared solutions were sprayed on glass substrates at a temperature of 350°C with a spray rate of 5 mL/min and a pyrolysis time of &#xa0;5&#xa0;s. The thickness of the prepared films was measured and it was 190 nm. The effects of changing the exposure time of the prepared films to cold plasma (5 and 10 min) on their crystalline and optical properties were studied. The results showed the relationship between the structural changes of the prepared films and their optical properties. The arrangement of atoms or molecules in a material affects how it interacts with light. Factors such as crystal structure, grain size, morphology, defects, and impurities influence light absorption, transmission, and reflection. Changes in these structural characteristics can alter the material’s optical behavior. For example, modifications in the crystal structure can impact the range of wavelengths absorbed or transmitted, while variations in grain size and morphology affect light scattering. Understanding and controlling the structure of films is crucial for optimizing their optical properties and tailoring them for specific applications. The structural types of the prepared CdO : Al thin films were investigated using X-ray diffraction (XRD) after and before exposure to cold plasma at 5 and 10 min, where XRD analysis revealed the presence of polycrystalline phase and showed cubic crystal structure with preferred orientation (111). In addition, a decrease in the intensity of the maximum peak of the CdO : Al films was observed after exposure to cold plasma, peak’s intensity decreases as the Al concentration increases. This drop in peak intensity is most likely caused by a&#xa0;loss in crystallinity and a change in the growth direction. The optical properties results using UV-Vis spectroscopy of the prepared films showed an increase in the energy gap and transmittance with increasing exposure to cold plasma.</p>

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Study of the Effect of Non-Thermal Plasma on the Structural and Optical Properties of Aluminum-Doped Cadmium Oxide Prepared by Chemical Spray Pyrolysis

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Hiba Qays Khaleel Al Qaisy,
  • N. D. Hamza,
  • Asmaa N. Mohammed Ali

摘要

Abstract

The present work is focused on the preparation of thin films of cadmium oxide doped with two percentages of aluminum, which are 1 and 3%, prepared by the pyrolysis technique. The prepared solutions were sprayed on glass substrates at a temperature of 350°C with a spray rate of 5 mL/min and a pyrolysis time of  5 s. The thickness of the prepared films was measured and it was 190 nm. The effects of changing the exposure time of the prepared films to cold plasma (5 and 10 min) on their crystalline and optical properties were studied. The results showed the relationship between the structural changes of the prepared films and their optical properties. The arrangement of atoms or molecules in a material affects how it interacts with light. Factors such as crystal structure, grain size, morphology, defects, and impurities influence light absorption, transmission, and reflection. Changes in these structural characteristics can alter the material’s optical behavior. For example, modifications in the crystal structure can impact the range of wavelengths absorbed or transmitted, while variations in grain size and morphology affect light scattering. Understanding and controlling the structure of films is crucial for optimizing their optical properties and tailoring them for specific applications. The structural types of the prepared CdO : Al thin films were investigated using X-ray diffraction (XRD) after and before exposure to cold plasma at 5 and 10 min, where XRD analysis revealed the presence of polycrystalline phase and showed cubic crystal structure with preferred orientation (111). In addition, a decrease in the intensity of the maximum peak of the CdO : Al films was observed after exposure to cold plasma, peak’s intensity decreases as the Al concentration increases. This drop in peak intensity is most likely caused by a loss in crystallinity and a change in the growth direction. The optical properties results using UV-Vis spectroscopy of the prepared films showed an increase in the energy gap and transmittance with increasing exposure to cold plasma.