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<p>Organic-inorganic hybrid FAPbI<sub>3</sub> perovskite quantum dots (PQDs) are promising materials for photovoltaic applications. However, the surface chemistry of PQDs directly influences their monodispersity and colloidal stability, which in turn governs the fabrication of high-quality PQD films. Herein, we report an <i>in-situ</i> ligand engineering strategy by introducing zinc picolinate into a ternary-precursor hot-injection PQD synthesis system. Comprehensive experimental analyses reveal that the ionized bidentate ligands effectively passivate surface defects during synthesis, thereby suppressing nonradiative recombination. Furthermore, zinc ions moderately retard the nucleation and growth process, leading to improved size uniformity of FAPbI<sub>3</sub> PQDs. Benefitting from this synergistic surface chemistry engineering, the optimized FAPbI<sub>3</sub> PQD solar cell achieves a PCE of 18.29%, ranking among the highest reported for PQD-based photovoltaics, along with enhanced device stability under ambient conditions. We believe our findings demonstrate a feasible and effective <i>in-situ</i> passivation approach and provide valuable insights into the surface chemistry of hybrid PQDs towards high-performing photovoltaic applications.</p>

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In-situ zinc picolinate ligand engineering enables quantum dot solar cells with 18.29% efficiency

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Du Li,
  • Chenyu Zhao,
  • Xuliang Zhang,
  • Wei Zhu,
  • Hehe Huang,
  • Xinyu Zhao,
  • Huifeng Li,
  • Zhangtao Min,
  • Jianyu Yuan

摘要

Organic-inorganic hybrid FAPbI3 perovskite quantum dots (PQDs) are promising materials for photovoltaic applications. However, the surface chemistry of PQDs directly influences their monodispersity and colloidal stability, which in turn governs the fabrication of high-quality PQD films. Herein, we report an in-situ ligand engineering strategy by introducing zinc picolinate into a ternary-precursor hot-injection PQD synthesis system. Comprehensive experimental analyses reveal that the ionized bidentate ligands effectively passivate surface defects during synthesis, thereby suppressing nonradiative recombination. Furthermore, zinc ions moderately retard the nucleation and growth process, leading to improved size uniformity of FAPbI3 PQDs. Benefitting from this synergistic surface chemistry engineering, the optimized FAPbI3 PQD solar cell achieves a PCE of 18.29%, ranking among the highest reported for PQD-based photovoltaics, along with enhanced device stability under ambient conditions. We believe our findings demonstrate a feasible and effective in-situ passivation approach and provide valuable insights into the surface chemistry of hybrid PQDs towards high-performing photovoltaic applications.