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<p>In this work, Perovskite CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> thin films were grown on glass substrates by mixing PbBr<sub>2</sub> with CH<sub>3</sub>NH<sub>3</sub>Br in DMF using dip coating technique in air atmosphere at 30&#xa0;s of dip time. In order to investigate the formation of CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> perovskite phase, the films were subjected to air annealing treatment for one hour at 100&#xa0;℃. The deposited films were characterized by XRD, SEM, Raman, and FTIR. The bandgap was calculated by Tauc plot equation using MATLAB Software. The results revealed the presence of cubic (CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub>) phase and the formation of organic-inorganic halide bond in the inorganic framework and organic CH<sub>3</sub> stretching/bending of C–H bond in the films. The surface film morphology changed from a porous surface to a homogeneous structure with large grain sizes after annealing at 100&#xa0;℃. The UV–visible analysis of the CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> films shows transparency in the visible range after annealing treatment, with a slight decrease in the optical gap from 2.45 to 2.14&#xa0;eV. After air annealing, the photocurrent of the films significantly increases from 2 to 11&#xa0;mA, while the photosensitivity decreased from 4.7&#xa0;V down to 1.58&#xa0;V. In terms of methylene blue (MB) degradation, the annealed perovskite film had a better degradation ratio of 78.25% under solar sunlight for 3&#xa0;h. This will open new ideas for the development of perovskite films to solve the photocatalytic problems and treat organic polluted water under solar sunlight.</p>

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Atmospheric synthesis of CH3NH3PbBr3 perovskite films for enhanced photocatalytic degradation of methylene blue under solar light: Impact of annealing treatment

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Samia Benhouria,
  • Linda Aissani,
  • Abdelkader Djelloul,
  • Lamia Radjehi,
  • Mohamed Farid Benlamnouar,
  • Mohamed Amine Soualili

摘要

In this work, Perovskite CH3NH3PbBr3 thin films were grown on glass substrates by mixing PbBr2 with CH3NH3Br in DMF using dip coating technique in air atmosphere at 30 s of dip time. In order to investigate the formation of CH3NH3PbBr3 perovskite phase, the films were subjected to air annealing treatment for one hour at 100 ℃. The deposited films were characterized by XRD, SEM, Raman, and FTIR. The bandgap was calculated by Tauc plot equation using MATLAB Software. The results revealed the presence of cubic (CH3NH3PbBr3) phase and the formation of organic-inorganic halide bond in the inorganic framework and organic CH3 stretching/bending of C–H bond in the films. The surface film morphology changed from a porous surface to a homogeneous structure with large grain sizes after annealing at 100 ℃. The UV–visible analysis of the CH3NH3PbBr3 films shows transparency in the visible range after annealing treatment, with a slight decrease in the optical gap from 2.45 to 2.14 eV. After air annealing, the photocurrent of the films significantly increases from 2 to 11 mA, while the photosensitivity decreased from 4.7 V down to 1.58 V. In terms of methylene blue (MB) degradation, the annealed perovskite film had a better degradation ratio of 78.25% under solar sunlight for 3 h. This will open new ideas for the development of perovskite films to solve the photocatalytic problems and treat organic polluted water under solar sunlight.