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<p>Lead-free metal halide perovskite materials are recognized as environmentally friendly because of their tunable bandgap, low toxicity, and unique properties, making them potential candidates for photodetectors, photovoltaics, and other applications. In this study, lead-free Cs<sub>0.2</sub>(4-methyl-2-pyridinamine [MPA])<sub>0.8</sub>BiI<sub>4</sub> perovskite single crystals were found to exhibit excellent photovoltaic properties and thermal stability. Organic–inorganic hybrid perovskite Cs<sub><i>x</i></sub>(MPA)<sub>1−<i>x</i></sub>BiI<sub>4</sub> single crystals were synthesized by hydrothermal crystallization. Doping with cesium ions tuned the bandgap to 1.7&#xa0;eV, producing efficient light absorption with reduced defect density and carrier recombination in the visible spectral range. The material exhibited significant thermal stability (up to 310°C), which was attributed to Cs<sup>+</sup>-induced lattice stabilization. The quasi-single-crystal films prepared by optimized spin-coating showed better charge transport kinetics, diode characteristics, and open-circuit voltage (<i>V</i><sub>OC</sub> = 0.53&#xa0;V). The device efficiency was improved by 24.08% relative to the cells based on undoped (MPA)BiI<sub>4</sub> owing to the reduction of grain boundaries and enhanced charge collection. These findings highlight that Cs<sup>+</sup>-doped Cs<sub>0.2</sub>(MPA)<sub>0.8</sub>BiI<sub>4</sub> perovskite single crystals are promising candidates for stable and highly efficient photovoltaic applications, including next-generation solar cells and photodetectors. Further studies on interface engineering and long-term operational stability will unlock their full potential for practical applications.</p>

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Cesium Ion-Enhanced Lead-Free Organic–Inorganic Hybrid Cs0.2(MPA)0.8BiI4 Perovskites Photovoltaic Properties and Quasi-Single-Crystal Thin Films

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Qiule Zhao,
  • Yin Zhu,
  • Xiaopeng Wei,
  • Guoyuan Zheng,
  • Shuang Chen,
  • Shuyi Mo,
  • Jilin Wang,
  • Disheng Yao,
  • Nan Tian,
  • Fei Long

摘要

Lead-free metal halide perovskite materials are recognized as environmentally friendly because of their tunable bandgap, low toxicity, and unique properties, making them potential candidates for photodetectors, photovoltaics, and other applications. In this study, lead-free Cs0.2(4-methyl-2-pyridinamine [MPA])0.8BiI4 perovskite single crystals were found to exhibit excellent photovoltaic properties and thermal stability. Organic–inorganic hybrid perovskite Csx(MPA)1−xBiI4 single crystals were synthesized by hydrothermal crystallization. Doping with cesium ions tuned the bandgap to 1.7 eV, producing efficient light absorption with reduced defect density and carrier recombination in the visible spectral range. The material exhibited significant thermal stability (up to 310°C), which was attributed to Cs+-induced lattice stabilization. The quasi-single-crystal films prepared by optimized spin-coating showed better charge transport kinetics, diode characteristics, and open-circuit voltage (VOC = 0.53 V). The device efficiency was improved by 24.08% relative to the cells based on undoped (MPA)BiI4 owing to the reduction of grain boundaries and enhanced charge collection. These findings highlight that Cs+-doped Cs0.2(MPA)0.8BiI4 perovskite single crystals are promising candidates for stable and highly efficient photovoltaic applications, including next-generation solar cells and photodetectors. Further studies on interface engineering and long-term operational stability will unlock their full potential for practical applications.