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Low-Temperature Phase-Transition for Compositional-Pure α-FAPbI3 Solar Cells with Low Residual-Stress and High

Ying Huang1, Jianghu Liang1, Zhanfei Zhang1

  • 1School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 20024, P. R. China.

Small Methods
|September 26, 2022
PubMed
Summary

A new method uses 3-chloropropylammonium chloride (Cl-PACl) to create pure α-FAPbI3 perovskite films at low temperatures. This approach reduces stress and improves compositional purity, leading to efficient and stable perovskite solar cells.

Keywords:
additivesformamidinium lead triiodideperovskite solar cellsphase transitions

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Chemistry

Background:

  • High processing temperatures for δ-FAPbI3 to α-FAPbI3 transition cause stress.
  • Additives like MACl leave residues, compromising compositional purity.
  • Need for low-temperature, stress-free, and compositionally pure α-FAPbI3 films.

Purpose of the Study:

  • To develop a low-temperature method for fabricating stress-released and compositionally pure α-FAPbI3 thin-films.
  • To investigate the role of 3-chloropropylammonium chloride (Cl-PACl) in the phase transition and film formation.
  • To enhance the performance and stability of perovskite solar cells.

Main Methods:

  • Two-step annealing process utilizing 3-chloropropylammonium chloride (Cl-PACl) as an additive.
  • Formation of a 2D template (n=2) at 80 °C to guide α-FAPbI3 formation.
  • Subsequent high-temperature annealing to volatilize Cl-PACl and disintegrate 2D templates.

Main Results:

  • Successfully fabricated stress-released and compositionally pure α-FAPbI3 thin-films at low temperatures.
  • Achieved high crystal orientation and reduced residual stress in the perovskite films.
  • Demonstrated that residual Cl-PA+ passivates defects and stabilizes the α-FAPbI3 phase.
  • Perovskite solar cells achieved a 23.03% power conversion efficiency with excellent phase and photo-stability.

Conclusions:

  • Cl-PACl enables low-temperature phase transition to α-FAPbI3 by reducing transition energy via a 2D template.
  • The method yields high-quality α-FAPbI3 films with reduced stress and improved purity.
  • The developed perovskite solar cells exhibit high efficiency and enhanced stability, paving the way for practical applications.