Pyrido-phenazine-Based Multifunctional Interface Molecules: Construction and Mechanism of High-Efficiency and Stable...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Organic-inorganic hybrid perovskite solar cells (PSCs) face commercialization hurdles due to perovskite film defects and interface issues.
• Efficient charge extraction and stable energy band alignment are critical for high-performance PSCs.

Purpose of the Study:

• To design and synthesize novel pyridine-phenazine core molecules (PPZ-TYA and PPZ-TYB).
• To investigate the role of these molecules as interface regulators in PSC fabrication.
• To enhance the efficiency and stability of PSCs through defect passivation and energy level optimization.

Main Methods:

• Synthesis of two pyridine-phenazine core molecules, PPZ-TYA and PPZ-TYB.
• Introduction of these molecules into the antisolvent during PSC fabrication.
• Characterization of perovskite film properties and device performance.
• Evaluation of PSC stability under aging conditions.

Main Results:

• The synthesized pyridine-phenazine molecules effectively passivated perovskite surface defects via multidentate coordination.
• Optimized energy band alignment at the interface improved charge extraction efficiency.
• PSCs modified with PPZ-TYA achieved a power conversion efficiency (PCE) of 23.5%.
• The modified PSCs retained 79.3% of their initial efficiency after 1000 hours of unencapsulated aging at 25 °C and 30-40% relative humidity.

Conclusions:

• Pyridine-phenazine molecules serve as effective interface regulators for high-performance PSCs.
• These molecules enhance both the efficiency and operational stability of perovskite solar cells.
• The findings highlight the potential of pyridine-phenazine derivatives for advancing PSC technology towards commercial viability.