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<p>The thin films of molybdenum (Mo) doped Cs<sub>2</sub>AgBiBr<sub>6</sub> lead-free halide double perovskite solar cells (LFHDPs), were synthesized through a sol–gel method. X-ray diffraction (XRD), UV–Vis spectroscopy, and J–V analysis were used to thoroughly examine the structural, optical, and electrical properties, respectively. XRD confirmed a cubic structure, with Mo doping increasing grain size. UV–Vis spectroscopy indicated a reduced bandgap energy (<i>E</i><sub>g</sub>) to 1.86&#xa0;eV and a refractive index increase to 2.77. The solar cells fabricated with these films and compared their efficiency. The geometry of the cell is Au/Spiro-OMeTAD/Cs<sub>2</sub>AgBiBr<sub>6</sub>/TiO<sub>2</sub>/FTO/glass. The fabricated Mo-doped solar cell exhibited improved parameters: short circuit current (<i>J</i><sub>SC</sub>) of 5.59&#xa0;mA-cm<sup>−2</sup>, fill factor (FF) of 0.755, open circuit voltage (<i>V</i><sub>OC</sub>) of 0.936&#xa0;V, and efficiency (<i>η</i>) of 3.95%. This <i>η</i> is 25.39% increased over pristine Cs<sub>2</sub>AgBiBr<sub>6</sub>. This comprehensive characterization suggests that Mo-doped Cs<sub>2</sub>AgBiBr<sub>6</sub> thin films hold the potential for enhanced photovoltaic performance in solar cell applications.</p>

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Enhancing efficiency of Cs2AgBiBr6 double perovskite solar cells through bandgap reduction by molybdenum doping

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Ihtisham-ul-haq,
  • M. I. Khan,
  • Lamia Ben Farhat,
  • Habib Elhouichet,
  • Rajendra P. Patil

摘要

The thin films of molybdenum (Mo) doped Cs2AgBiBr6 lead-free halide double perovskite solar cells (LFHDPs), were synthesized through a sol–gel method. X-ray diffraction (XRD), UV–Vis spectroscopy, and J–V analysis were used to thoroughly examine the structural, optical, and electrical properties, respectively. XRD confirmed a cubic structure, with Mo doping increasing grain size. UV–Vis spectroscopy indicated a reduced bandgap energy (Eg) to 1.86 eV and a refractive index increase to 2.77. The solar cells fabricated with these films and compared their efficiency. The geometry of the cell is Au/Spiro-OMeTAD/Cs2AgBiBr6/TiO2/FTO/glass. The fabricated Mo-doped solar cell exhibited improved parameters: short circuit current (JSC) of 5.59 mA-cm−2, fill factor (FF) of 0.755, open circuit voltage (VOC) of 0.936 V, and efficiency (η) of 3.95%. This η is 25.39% increased over pristine Cs2AgBiBr6. This comprehensive characterization suggests that Mo-doped Cs2AgBiBr6 thin films hold the potential for enhanced photovoltaic performance in solar cell applications.