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Intermediate-Phase-Modified Crystallization for Stable and Efficient CsPbI3 Perovskite Solar Cells.

Liying Zhang1,2, Tianle Guo1,3, Boyuan Liu1,2

  • 1Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, P. R. China.

ACS Applied Materials & Interfaces
|April 25, 2022
PubMed
Summary

Introducing a new method for perovskite solar cells (PSCs), this study enhances CsPbI3 film crystallization. The intermediate-phase-modified crystallization (IPMC) method boosts efficiency and stability for high-quality perovskite films.

Keywords:
cesium lead iodidecrystallization controldefect passivationhydrogen bondingperovskite solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Chemistry

Background:

  • All-inorganic CsPbI3 perovskite solar cells (PSCs) show promise due to their photovoltaic properties.
  • Poor crystallization of CsPbI3 perovskite films hinders the development of high-performance devices.

Purpose of the Study:

  • To develop a novel method for improving the crystallization of CsPbI3 perovskite films.
  • To enhance the efficiency and long-term stability of CsPbI3 PSCs.

Main Methods:

  • The intermediate-phase-modified crystallization (IPMC) method was employed, introducing pyrrolidine hydroiodide (PI) prior to perovskite formation.
  • Hydrogen bonding interactions between PI and dimethylammonium iodide (DMAI) were utilized to improve crystallization conditions.
  • The transition from the DMAPbI3 phase to the desired CsPbI3 phase was promoted.

Main Results:

  • The IPMC method reduced trap density and optimized energy alignment for improved electron-hole separation.
  • CsPbI3 perovskite films fabricated using IPMC achieved a power conversion efficiency (PCE) of 18.72%.
  • Devices maintained 85% of their initial PCE after 1000 hours of ambient storage.

Conclusions:

  • The IPMC method offers a convenient approach for fabricating high-quality CsPbI3 perovskite films.
  • This technique enhances both the efficiency and stability of perovskite solar cells.
  • The findings provide valuable insights for the industrial production of advanced perovskite solar technologies.