Polyfluorinated Organic Diammonium Induced Lead Iodide Arrangement for Efficient Two-Step-Processed Perovskite Solar...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) face challenges with inefficient lead iodide conversion using the two-step fabrication method.
• Improving PSC performance requires addressing issues in film quality and charge dynamics.

Purpose of the Study:

• To investigate the effect of a polyfluorinated organic diammonium salt, octafluoro-([1,1 -biphenyl]-4,4 -diyl)-dimethanaminium (OFPP) iodide, on perovskite film formation and PSC performance.
• To enhance the conversion efficiency and stability of PSCs through modulated perovskite film properties.

Main Methods:

• Introduction of OFPP iodide to create a discontinuous lead iodide layer, promoting uniform perovskite conversion.
• Characterization of the OFPP-modulated perovskite (OFPP-PVK) film for crystallinity, grain size, and defect passivation.
• Fabrication and testing of OFPP-based PSCs and large-area modules.

Main Results:

• OFPP iodide facilitated satisfactory conversion of lead iodide to perovskite with improved crystallinity and larger grains.
• OFPP-PVK films exhibited enhanced charge mobility and reduced charge recombination due to effective defect passivation.
• OFPP-based PSCs achieved a champion efficiency of 24.76%, with improved device stability.
• A large-area perovskite module (100 cm²) demonstrated a superior efficiency of 21.04%.

Conclusions:

• OFPP iodide acts as an effective additive for boosting PSC performance by optimizing perovskite formation and film quality.
• The study highlights the potential of organic diammonium salts in advancing perovskite solar cell technology.
• This approach offers a promising strategy for developing highly efficient and stable perovskite solar cells and modules.