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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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Functionalized Solid Solubilizer for Modulating Residual PbI2 toward Efficient and Stable Perovskite Solar Cells.

Rui Han1, Yao Yao1, Le Liu2

  • 1Guangdong Engineering Technology Research Center of Advanced Polymer Synthesis, Key (Guangdong-Hong Kong Joint) Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, College of Chemistry and Chemical Engineering, Shantou University, Shantou 515063, Guangdong, China.

ACS Applied Materials & Interfaces
|April 6, 2026
PubMed
Summary

Controlling residual lead iodide (PbI2) aggregation with 1-acetylpyridinium chloride (APC) improves perovskite solar cell (PSC) efficiency and stability. This method enhances film uniformity and device longevity.

Keywords:
bulk additivecrystallization modulationmultifunctional ligandperovskite solar cellssolid solubilizer

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Controlling residual lead iodide (PbI2) aggregation is key for perovskite solar cell (PSC) efficiency and stability.
  • Residual PbI2 can hinder performance and lead to degradation.

Purpose of the Study:

  • To investigate the use of 1-acetylpyridinium chloride (APC) as a solid solubilizer to suppress PbI2 aggregation.
  • To enhance the power conversion efficiency (PCE) and long-term stability of PSCs.

Main Methods:

  • Incorporation of APC into the perovskite precursor solution.
  • Analysis of film morphology, PbI2 distribution, and defect density.
  • Fabrication and testing of PSCs with and without APC.

Main Results:

  • APC effectively suppressed PbI2 aggregation, improving film uniformity and reducing defect density.
  • PSCs with APC achieved a champion PCE of 24.87%, compared to 23.34% for the control.
  • Devices with APC retained 90% of their initial PCE after 1500 hours of storage.

Conclusions:

  • APC is a feasible strategy for controlling PbI2 aggregation in PSCs.
  • The use of APC leads to highly efficient and stable perovskite solar cells.
  • This approach offers a pathway to improved PSC performance and durability.