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<p>Enhancing the performance and stability of wide-bandgap inorganic perovskites is essential for next-generation tandem photovoltaic applications. In this work, a simple additive-engineering strategy was employed by incorporating 5&#xa0;mol% formamidinium bromide (FABr) into CsPbIBr₂ thin films to improve their structural, optical, and photovoltaic properties. X-ray diffraction confirmed the preservation of the cubic perovskite phase with enhanced crystallinity following FABr incorporation. Scanning Electron Microscopy analysis revealed enlarged and compact grains with reduced pinholes, indicating improved film morphology and defect passivation. Optical investigations showed a slight reduction in bandgap Energy from 1.98 to 1.95&#xa0;eV and enhanced light–matter interaction, while photoluminescence measurements demonstrated stronger and red-shifted emission, suggesting reduced trap-assisted recombination. As a result, perovskite solar cells based on FABr-modified CsPbIBr₂ exhibited a significant increase in power conversion efficiency from 9.09% to 11.19%, accompanied by External quantum efficciency values exceeding 90% and enhanced charge-transfer characteristics confirmed by electrochemical impedance spectroscopy. Furthermore, the FABr-modified device retained 88.7% of its initial efficiency after 336&#xa0;h, compared with 81.3% for the pristine device. The improved performance is attributed to enhanced crystallization and defect passivation induced by FABr, while partial FA⁺ incorporation into the perovskite lattice is proposed as a plausible contributing mechanism based on the collective experimental observations. These findings establish FABr incorporation as an effective and scalable approach for developing highly efficient and stable wide-bandgap inorganic perovskite solar cells for future photovoltaic technologies.</p>

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Enhanced crystallinity and photovoltaic performance of FABr-modified CsPbIBr2 perovskite solar cells

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Dhafer O. Alshahrani

摘要

Enhancing the performance and stability of wide-bandgap inorganic perovskites is essential for next-generation tandem photovoltaic applications. In this work, a simple additive-engineering strategy was employed by incorporating 5 mol% formamidinium bromide (FABr) into CsPbIBr₂ thin films to improve their structural, optical, and photovoltaic properties. X-ray diffraction confirmed the preservation of the cubic perovskite phase with enhanced crystallinity following FABr incorporation. Scanning Electron Microscopy analysis revealed enlarged and compact grains with reduced pinholes, indicating improved film morphology and defect passivation. Optical investigations showed a slight reduction in bandgap Energy from 1.98 to 1.95 eV and enhanced light–matter interaction, while photoluminescence measurements demonstrated stronger and red-shifted emission, suggesting reduced trap-assisted recombination. As a result, perovskite solar cells based on FABr-modified CsPbIBr₂ exhibited a significant increase in power conversion efficiency from 9.09% to 11.19%, accompanied by External quantum efficciency values exceeding 90% and enhanced charge-transfer characteristics confirmed by electrochemical impedance spectroscopy. Furthermore, the FABr-modified device retained 88.7% of its initial efficiency after 336 h, compared with 81.3% for the pristine device. The improved performance is attributed to enhanced crystallization and defect passivation induced by FABr, while partial FA⁺ incorporation into the perovskite lattice is proposed as a plausible contributing mechanism based on the collective experimental observations. These findings establish FABr incorporation as an effective and scalable approach for developing highly efficient and stable wide-bandgap inorganic perovskite solar cells for future photovoltaic technologies.