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Polymer-Assisted Crystallization and Defect Passivation in Planar Wide-Bandgap FAPbBr3 Perovskite Solar Cells.

Amalraj Peter Amalathas1,2, Loheeswaran Selvadurai1,3, Lucie Landová2,4

  • 1Department of Physics, Faculty of Science, University of Jaffna, Jaffna 40000, Sri Lanka.

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Poly-(methyl methacrylate) (PMMA) incorporation passivates defects in wide-bandgap perovskite solar cells. This strategy enhances film quality, boosts efficiency, and improves stability for advanced photovoltaic applications.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Solid-State Chemistry

Background:

  • Wide-bandgap lead bromide perovskites (FAPbBr3) are crucial for tandem solar cells and high-voltage optoelectronics.
  • Performance is hindered by defects causing nonradiative recombination and instability.

Purpose of the Study:

  • To develop a defect passivation and crystallization control strategy for FAPbBr3 films.
  • To enhance the efficiency and stability of perovskite solar cells using polymer incorporation.

Main Methods:

  • Incorporating poly-(methyl methacrylate) (PMMA) into the antisolvent during FAPbBr3 film fabrication.
  • Utilizing FTIR and Photothermal Deflection Spectroscopy (PDS) for material characterization.
  • Analyzing film morphology, crystallinity, defect states, and optoelectronic properties.

Main Results:

  • PMMA treatment improved film morphology (larger grains, reduced roughness) and crystallinity.
  • FTIR confirmed PMMA's carbonyl groups passivate undercoordinated Pb2+ ions, reducing trap states.
  • PDS indicated suppressed deep-level defects and reduced energetic disorder.
  • Photoluminescence, carrier lifetimes, and trap densities showed reduced nonradiative recombination.
  • PMMA increased open-circuit voltage (Voc) by >100 mV, improved power conversion efficiency by >1%, reaching 1.510 V Voc.
  • Reduced hysteresis and enhanced ambient stability were observed.

Conclusions:

  • Polymer-assisted strategies effectively passivate defects and control crystallization in wide-bandgap perovskites.
  • PMMA incorporation offers a viable pathway to enhance both efficiency and stability of perovskite solar cells.
  • This approach is promising for high-voltage and tandem photovoltaic applications.