High-Performance Perovskite Solar Cells via 3D Covalent Organic Frameworks: Enhanced Efficiency Through Precision...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Covalent organic frameworks (COFs) are versatile porous polymers with tunable structures.
• Integrating COFs into perovskite solar cells (PSCs) addresses challenges like instability and recombination.
• COFs offer benefits such as improved charge transport and defect passivation.

Purpose of the Study:

• To engineer COFs for interfacial modification in PSCs.
• To investigate the impact of COFs on PSC performance and stability.
• To explore COFs as multifunctional modifiers for enhanced solar energy conversion.

Main Methods:

• Schiff base reactions were used to synthesize two donor-acceptor (D-A) type COFs.
• COFs were integrated into the self-assembled (SAM) layers of PSCs.
• Characterizations and theoretical calculations were performed to analyze COF integration effects.

Main Results:

• COFs optimized the energy level of the ITO/SAM substrate.
• COFs effectively passivated perovskite defects and suppressed recombination.
• Carrier transport and extraction were significantly enhanced, increasing power conversion efficiency (PCE).

Conclusions:

• COFs act as effective multifunctional modifiers for PSC interfacial engineering.
• The integration of COFs offers a promising route to improve PSC performance and stability.
• Achieved PCE increased from 22.57% to 25.20% and 24.21% with COF modification.