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Flash Infrared Annealing for Perovskite Solar Cell Processing
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Fluorine-Containing Passivation Layer via Surface Chelation for Inorganic Perovskite Solar Cells.

Hao Zhang1, Wanchun Xiang1, Xuejiao Zuo1

  • 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, School of Materials Science and Engineering, Shaanxi Normal University, No. 620, West Chang'an Avenue, Xi'an, 710119, P. R. China.

Angewandte Chemie (International Ed. in English)
|December 8, 2022
PubMed
Summary
This summary is machine-generated.

Trifluoroacetamidine (TFA) passivator effectively reduces defects in inorganic perovskite solar cells (PSCs). This breakthrough achieves record power conversion efficiencies and enhances device stability, paving the way for advanced solar technologies.

Keywords:
ChelationDefect PassivationInorganicPerovskiteSolar Cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Surface defects critically limit power conversion efficiency (PCE) and stability in inorganic perovskite solar cells (PSCs).
  • Addressing these defects is essential for advancing PSC technology.

Purpose of the Study:

  • To design and implement a novel passivator, trifluoroacetamidine (TFA), for inorganic CsPbI3-x Brx perovskite films.
  • To suppress film defects and enhance the performance and stability of PSCs.

Main Methods:

  • Utilized trifluoroacetamidine (TFA) as a surface passivator for CsPbI3-x Brx perovskite films.
  • Investigated the chelation of TFA's amidine group onto the perovskite surface to mitigate iodide vacancies.
  • Analyzed the role of fluorine atoms in TFA for forming intermolecular hydrogen bonds and moisture shielding.

Main Results:

  • TFA treatment significantly suppressed recombination in PSCs.
  • Achieved record PCEs of 21.35% (0.09 cm2) and 17.21% (1.0 cm2) for all-inorganic PSCs.
  • Demonstrated a record PCE of 39.78% under indoor illumination and excellent ambient stability, retaining 93% PCE after 960 hours.

Conclusions:

  • Trifluoroacetamidine is a highly effective passivator for inorganic perovskite solar cells.
  • TFA enables significant improvements in both power conversion efficiency and operational stability.
  • The developed passivation strategy offers a promising route for next-generation perovskite solar devices.