Perovskite Solar Cells Based on Regulated Crystallization of Multifunctional Pyridine Molecules

Area of Science:

• Materials Science
• Photovoltaics
• Chemical Engineering

Background:

• Perovskite film crystallization is sensitive to environmental factors and fabrication, leading to defects.
• Controlled crystallization is essential for high-performance perovskite solar cells.
• Defect formation and poor morphology hinder perovskite solar cell efficiency and stability.

Purpose of the Study:

• To develop a doping strategy for modulating perovskite crystallization.
• To improve the quality and performance of perovskite films for solar cell applications.
• To investigate the effect of 6-chloropyridine-3-sulfonamide (6-CPS) on perovskite crystallization and device characteristics.

Main Methods:

• A doping strategy using 6-chloropyridine-3-sulfonamide (6-CPS) was proposed.
• The multifunctional 6-CPS molecule was used to modulate perovskite crystallization through multisite coordination.
• Perovskite films were fabricated and characterized, and device performance and stability were evaluated.

Main Results:

• 6-CPS effectively regulated perovskite crystallization, yielding high-quality films with optimized morphology and reduced defect density.
• 6-CPS modification improved energy level alignment and enhanced optoelectronic performance.
• Optimized 6-CPS-modified devices achieved a champion power conversion efficiency (PCE) of 24.56% and retained 85.44% PCE after 720 h of aging.

Conclusions:

• 6-CPS is an effective dopant for controlling perovskite crystallization and improving perovskite solar cell performance.
• The proposed doping strategy offers a promising route to achieve high-efficiency and stable perovskite solar cells.
• Multisite coordination of 6-CPS plays a key role in enhancing film quality and device stability.