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<p>The quality of the perovskite active layer is crucial for the performance of perovskite solar cells (PSCs), as it significantly influences both light absorption and charge carrier extraction. To produce high-quality solution-processed (FA<sub>0.85</sub>Cs<sub>0.15</sub>Pb(I<sub>0.85</sub>Br<sub>0.15</sub>)<sub>3</sub>) films, this study demonstrates the effective use of graphene oxide (GO) as an additive in the precursor solution. It was revealed that the incorporation of GO has effectively enhanced the performance of the devices, even without any additional passivation strategy. We evaluated the impact of our doping methods using optical, chemical, morphological, structural and electrical characterization techniques. X-ray photoelectron spectroscopy specifically revealed that the atomic ratios of the perovskite remained stable even after the addition of GO, with only a slight shift in the core-level spectra, suggesting a possible charge-transfer interaction between GO and perovskite rather than a change in chemical compositions. As the content of GO increases in the perovskite active layer, UV–Visible and photoluminescence spectroscopy demonstrate significant improvements in light harvesting and charge separation efficiency, respectively. Also, the crystallization and homogeneity of the perovskite thin films were improved as revealed through X-ray diffraction and atomic force microscopy measurements. These improvements resulted in enhanced photovoltaic performance of the corresponding devices with a very significant improvement (&gt; 20%) of average efficiency under full sun illumination compared to reference devices with no GO.</p>

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Graphene oxide-incorporated mixed cation FA-Cs perovskite layer for better efficiency solar cells

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Souhir Azzaz,
  • Ceren Yildirim,
  • Sylvain Vedraine,
  • Johann Bouclé,
  • Abdelaziz Bouazizi

摘要

The quality of the perovskite active layer is crucial for the performance of perovskite solar cells (PSCs), as it significantly influences both light absorption and charge carrier extraction. To produce high-quality solution-processed (FA0.85Cs0.15Pb(I0.85Br0.15)3) films, this study demonstrates the effective use of graphene oxide (GO) as an additive in the precursor solution. It was revealed that the incorporation of GO has effectively enhanced the performance of the devices, even without any additional passivation strategy. We evaluated the impact of our doping methods using optical, chemical, morphological, structural and electrical characterization techniques. X-ray photoelectron spectroscopy specifically revealed that the atomic ratios of the perovskite remained stable even after the addition of GO, with only a slight shift in the core-level spectra, suggesting a possible charge-transfer interaction between GO and perovskite rather than a change in chemical compositions. As the content of GO increases in the perovskite active layer, UV–Visible and photoluminescence spectroscopy demonstrate significant improvements in light harvesting and charge separation efficiency, respectively. Also, the crystallization and homogeneity of the perovskite thin films were improved as revealed through X-ray diffraction and atomic force microscopy measurements. These improvements resulted in enhanced photovoltaic performance of the corresponding devices with a very significant improvement (> 20%) of average efficiency under full sun illumination compared to reference devices with no GO.