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(111)-Dominated Perovskite Films by Antisolvent Engineering.

Xiangyu Sun1, Dongni Li1, Lu Zhao1

  • 1Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, Experimental Center of Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Advanced Materials (Deerfield Beach, Fla.)
|April 7, 2023
PubMed
Summary

Researchers developed a new method to create highly oriented perovskite films for improved solar cell performance. This technique enhances carrier mobility, reduces defects, and boosts stability, leading to efficient and durable perovskite solar cells.

Keywords:
antisolventsdefectshigh-orientation perovskitesmicrostructural controlworking stability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Perovskite solar cells (PSCs) performance is limited by grain-to-grain variations in randomly oriented films.
  • Controlling crystal orientation in perovskite films is crucial for enhanced device efficiency and stability.
  • Standard fabrication methods often result in chaotic orientations due to intermediate phase conversions.

Purpose of the Study:

  • To develop a method for fabricating perovskite films with a dominant (111) crystal orientation.
  • To investigate the impact of this preferred orientation on film properties and PSC performance.
  • To improve the efficiency and long-term stability of perovskite solar cells.

Main Methods:

  • Utilized short-chain isomeric alcohol antisolvents, isopropanol (IPA) or isobutanol (IBA), in a one-step antisolvent method.
  • Investigated the interaction between IPA and lead iodide (PbI2) to control intermediate phase formation.
  • Fabricated (111)-oriented alpha-formamidinium lead iodide (α-FAPbI3) films.

Main Results:

  • Achieved high-quality perovskite films with a dominant (111) orientation ((111)-α-FAPbI3).
  • The (111)-oriented films exhibited improved carrier mobility, uniform surface potential, reduced defects, and enhanced photostability compared to randomly oriented films.
  • Perovskite solar cells based on these films demonstrated a power conversion efficiency of 22% and excellent operational and storage stability.

Conclusions:

  • The use of IPA or IBA as antisolvents effectively promotes (111)-preferred orientation in α-FAPbI3 films.
  • (111)-oriented perovskite films offer superior optoelectronic properties and stability for PSC applications.
  • This fabrication strategy significantly enhances PSC performance and durability.