Inhibiting Iodide Oxidation and Regulating Crystallization Synergistically Enable Efficient and Stable Air-Processed...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Fabricating perovskite solar cells under ambient conditions is crucial for industrial scalability.
• Iodide oxidation and uncontrolled crystallization are key challenges for air-processed perovskite solar cells.

Purpose of the Study:

• To introduce pentaerythrityl tetrakis(3-mercaptopropionate) (PETMP) into CsPbI₂Br precursor solutions.
• To simultaneously inhibit iodide oxidation and regulate perovskite crystallization for high-performance air-processed solar cells.

Main Methods:

• Incorporation of PETMP into CsPbI₂Br precursor solutions.
• Investigating the coordination interaction between PETMP and the precursor.
• Utilizing the reductive -SH groups of PETMP to convert molecular iodine to iodide.

Main Results:

• PETMP addition stabilized the precursor and slowed crystallization.
• PETMP effectively suppressed iodide oxidation by converting iodine to iodide.
• Fabricated high-quality CsPbI₂Br films with enlarged grains and reduced defect density.
• Achieved a 15.20% power conversion efficiency for air-processed solar cells without a hole-transport layer.
• Demonstrated excellent stability, retaining 88.7% efficiency after 1200 hours under ambient conditions.

Conclusions:

• PETMP is an effective additive for air-processed CsPbI₂Br perovskite solar cells.
• The developed method offers a pathway for cost-effective and scalable manufacturing of efficient solar cells.
• The study highlights the potential for ambient air processing in advancing perovskite solar technology.