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Updated: May 31, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Enhanced Efficiency and Stability in Blade-Coated Perovskite Solar Cells through Using

Yaomiao Feng1, Neil Mallo1, Oliver Lindsay1

  • 1Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia.

ACS Applied Materials & Interfaces
|January 24, 2025
PubMed
Summary
This summary is machine-generated.

Adding fluorinated ammonium halides to perovskite solar cells improves their efficiency and stability. Specifically, FEACl additive resulted in high power conversion efficiency (PCE) and enhanced thermal and humidity resistance.

Keywords:
counteraniondefect passivationnitrogen knife-assisted blade-coatingperovskite solar cellsstability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Perovskite solar cell (PSC) power conversion efficiency (PCE) depends on fabrication methods and perovskite composition.
  • Air knife-assisted blade coating yields good perovskite films, but device efficiencies often trail spin-coated counterparts.

Purpose of the Study:

  • To investigate the impact of 2,3,4,5,6-pentafluorophenylethylammonium halides (FEAX) as additives in nitrogen knife-assisted blade-coated methylammonium lead iodide (MAPbI3) PSCs.
  • To enhance the quality, efficiency, and stability of blade-coated perovskite films.

Main Methods:

  • Incorporation of three FEAX additives (X = I-, Br-, Cl-) into MAPbI3 perovskite layers fabricated by nitrogen knife-assisted blade coating.
  • Characterization of perovskite film quality, including crystal size, defect passivation, photoluminescence (PL) intensity, PL lifetime, and trap density.
  • Fabrication and performance testing of resulting PSC devices, including open-circuit voltage (Voc) and PCE measurements.
  • Evaluation of device stability under thermal stress and humid conditions during maximum-power-point (MPP) tracking.

Main Results:

  • All FEAX additives effectively passivated defects in MAPbI3 films.
  • FEACl additive resulted in perovskite films with the largest crystal size, fewest defects, highest PL intensity, longest average PL lifetime, and lowest trap density.
  • Devices incorporating FEACl achieved a high open-circuit voltage (Voc) of 1.17 V and a PCE of 21.4%.
  • Hydrophobic fluorinated cations improved device stability; FEACl-containing devices exhibited superior thermal stability and performance in humid environments (65% RH at 50°C).

Conclusions:

  • FEAX additives, particularly FEACl, significantly enhance the performance and stability of nitrogen knife-assisted blade-coated MAPbI3 perovskite solar cells.
  • The improved film quality, characterized by larger crystals and reduced defects, directly correlates with higher device efficiency and voltage.
  • The hydrophobic nature of the additives contributes to enhanced operational stability under challenging environmental conditions, making blade-coated PSCs a more viable technology.