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<p>This article has been allocated to studying microstructural features and optical properties of the polycrystalline thin ZnO films. ZnO thin films were deposited on glass substrates using a sol–gel dip-coating process with varied layer numbers (8, 10, and 12). Structural characterization via XRD confirmed a polycrystalline wurtzite structure with enhanced crystallinity as the number of layers increased and increasing the crystallite size from 34.8 ± 0.6 to 40.9 ± 0.7 nm. FE-SEM analysis revealed increased surface wrinkle size and reduced grain boundaries with thickness. Optical measurements showed high transmittance (&gt; 80%) in the visible region and a slight reduction in bandgap energy from 3.17 ± 0.07 to 3.11 ± 0.03 eV with an increase in Urbach energy from 763.9 ± 5.3 to 847.3 ± 6.1meV. Photocatalytic performance was evaluated by degrading Rhodamine B under UV light, showing a significant enhancement in degradation rate from 0.034 ± 0.007 to 0.072 ± 0.008 min<sup>−1</sup> with increased film thickness. These findings highlight the potential of thickness-optimized ZnO films for environmental photocatalytic applications.</p>

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Layer-dependent photocatalytic efficiency of ZnO Thin films: kinetic analysis, structural insights and optical bandgap characterization using absorption spectrum fitting, Tauc’s plot, and Cody models

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Ibrahim Yaacoub Bouderbala,
  • Amir Guessoum,
  • Selma Rabhi,
  • Abdelmadjid Herbadji,
  • Imed-Eddine Bouras

摘要

This article has been allocated to studying microstructural features and optical properties of the polycrystalline thin ZnO films. ZnO thin films were deposited on glass substrates using a sol–gel dip-coating process with varied layer numbers (8, 10, and 12). Structural characterization via XRD confirmed a polycrystalline wurtzite structure with enhanced crystallinity as the number of layers increased and increasing the crystallite size from 34.8 ± 0.6 to 40.9 ± 0.7 nm. FE-SEM analysis revealed increased surface wrinkle size and reduced grain boundaries with thickness. Optical measurements showed high transmittance (> 80%) in the visible region and a slight reduction in bandgap energy from 3.17 ± 0.07 to 3.11 ± 0.03 eV with an increase in Urbach energy from 763.9 ± 5.3 to 847.3 ± 6.1meV. Photocatalytic performance was evaluated by degrading Rhodamine B under UV light, showing a significant enhancement in degradation rate from 0.034 ± 0.007 to 0.072 ± 0.008 min−1 with increased film thickness. These findings highlight the potential of thickness-optimized ZnO films for environmental photocatalytic applications.