Molecular Additive Engineering for Process-Humidity Robustness and Reproducible Fabrication of Perovskite Solar Cells...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) face commercialization hurdles due to humidity sensitivity, impacting film crystallization and device stability.
• Moisture degrades PSC performance by inducing defects and hindering stable crystal formation.

Purpose of the Study:

• To introduce diphenylvinylphosphine (DPVP) as a Lewis base additive for ambient-air PSC fabrication.
• To enhance PSC performance, reproducibility, and stability under realistic humidity conditions.

Main Methods:

• Incorporation of DPVP as an additive during PSC fabrication under ambient-air conditions.
• Evaluation of film uniformity, defect density, and crystallization stability in the presence of DPVP.
• Device performance testing including power conversion efficiency (PCE) and long-term stability under operational stress.

Main Results:

• DPVP effectively suppresses moisture-induced defects and stabilizes crystallization at 20-40% relative humidity.
• Achieved champion PCEs of 24.2% for small-area devices and 20.5% for 12 cm² blade-coated mini-modules.
• DPVP-assisted modules retained over 85% efficiency after 900 hours of maximum power point tracking at 65 °C.

Conclusions:

• DPVP is a scalable additive for humidity-resilient perovskite photovoltaic manufacturing.
• The study demonstrates a viable strategy for producing stable and efficient PSCs under ambient conditions.
• DPVP facilitates reproducible device performance and enhanced operational stability, paving the way for commercialization.