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Kinetics Controlled Perovskite Crystallization for High Performance Solar Cells.

Jinghao Ge1, Ran Chen2, Yabin Ma3

  • 1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, International Joint Research Center of Shaanxi Province for Photoelectric Materials Science, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, No. 620, West Chang'an Avenue, Xi'an, 710119, China.

Angewandte Chemie (International Ed. in English)
|January 25, 2024
PubMed
Summary

Researchers developed a new method to control perovskite crystallization for solar cells. Elastic modulus regulation enhances grain growth, boosting power conversion efficiency and stability.

Keywords:
Oswald ripeningPerovskite solar cellscrystallization kineticsnucleationsurface energy

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Area of Science:

  • Materials Science
  • Renewable Energy

Background:

  • Perovskite solar cells (PSCs) show rapid development in power conversion efficiencies (PCEs).
  • Controlling perovskite thin-film crystallization is crucial for device performance.
  • A key challenge is the mismatch between nucleation and Oswald ripening during crystallization.

Purpose of the Study:

  • To introduce a novel mechanism for controlling perovskite crystallization.
  • To enhance nucleation site formation and accelerate Oswald ripening.
  • To improve the power conversion efficiency and stability of PSCs.

Main Methods:

  • Reduced surface energy of perovskite films from 44.9 to 36.1 mN/m.
  • Employed elastic modulus regulation to improve grain solubility.
  • Investigated the effect of these modifications on the ripening rate.

Main Results:

  • The ripening rate increased from 2.37 to 4.61 Åm⋅s⁻¹.
  • Optimized perovskite films yielded solar cells with PCE improved from 23.14% to 25.32%.
  • Achieved excellent thermal stability (82% PCE after 800h at 85°C) and improved light stability.

Conclusions:

  • Elastic modulus regulation is a viable method to enhance the ripening process in perovskite films.
  • This approach offers a new pathway to improve PSC performance and durability.
  • The findings contribute to the advancement of high-efficiency and stable perovskite solar cell technology.