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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Direct Nanocrystal Seeding Enables Buried Interface Passivation and Enhanced Crystallization for FAPbI3 Solar Cells.

Chenyuan Shang1, Fangzhou Liu1, Cuncun Wu1

  • 1Key Laboratory of Materials Laminating Fabrication and Interface Control Technology of Tianjin, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|June 18, 2026
PubMed
Summary

Adding cesium lead bromide nanocrystals to formamidinium lead iodide perovskites improves solar cell efficiency and stability. This strategy passivates defects and controls crystallization for high-performance devices.

Keywords:
buried interface passivationnanocrystalsperovskite solar cellsseed‐mediated crystallization

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Formamidinium lead iodide (FAPbI3)-based perovskites show potential for solar absorbers due to their optimal bandgap.
  • Lattice strain and phase instability in FAPbI3 cause interfacial defects, limiting device performance and stability.
  • Nonradiative recombination at these defects hinders efficient charge carrier utilization.

Purpose of the Study:

  • To develop a facile strategy for improving the quality and stability of FAPbI3-based perovskite films.
  • To address interfacial defects and control crystallization in FAPbI3 perovskites.
  • To enhance the power conversion efficiency and operational stability of perovskite solar cells.

Main Methods:

  • Incorporating cesium lead bromide (CsPbBr3) nanocrystals (NCs) into the FAPbI3 precursor solution.
  • Utilizing quasi-in-situ monitoring to observe the crystallization process.
  • Fabricating and characterizing perovskite solar cells with the modified films.

Main Results:

  • The addition of CsPbBr3 NCs simultaneously modulated crystallization and passivated defects.
  • CsPbBr3 NCs acted as crystallization seeds and passivated the buried interface through partial ionization.
  • Perovskite solar cells achieved a champion power conversion efficiency of 24.63%, outperforming control devices.
  • Encapsulated devices maintained over 80% of their initial efficiency after 1000 hours of continuous operation.

Conclusions:

  • Blending CsPbBr3 NCs is an effective method for producing high-quality, stable perovskite films.
  • This approach significantly enhances the performance and longevity of perovskite solar cells.
  • The strategy offers a promising pathway for advancing perovskite photovoltaic technology.