Ethanol-Assisted Green-Solvent-Based Strategy for Slot-Die Coated Perovskite Solar Cells with over 70% Eco-Friendly...

Area of Science:

• Materials Science
• Renewable Energy
• Chemical Engineering

Background:

• Perovskite solar cells (PSCs) show high power conversion efficiencies.
• Commercial viability requires scalable and eco-friendly fabrication methods.
• Toxic solvents like DMF and 2-methoxyethanol hinder green manufacturing in slot-die coating.

Purpose of the Study:

• To develop a green solvent engineering strategy for PSC fabrication.
• To reduce hazardous solvent content in perovskite precursor solutions using ethanol.
• To improve film uniformity and device performance in scalable slot-die coating processes.

Main Methods:

• Incorporated ethanol, a low-toxicity solvent, into perovskite precursor solutions.
• Reduced hazardous solvent fraction from 50% to 30% by volume.
• Utilized slot-die coating for perovskite film fabrication.

Main Results:

• Ethanol addition improved substrate wetting and vapor pressure for uniform film formation.
• Increased ethanol content enhanced perovskite film crystallinity and morphology.
• Achieved a champion power conversion efficiency of 23.72% with improved device stability (>750 hours).

Conclusions:

• A viable green solvent strategy using ethanol enables environmentally responsible PSC manufacturing.
• This approach addresses the challenge of toxic solvents in scalable PSC fabrication.
• The optimized process leads to high-efficiency and stable perovskite solar cells.