Universal Ion Migration Suppression Strategy Based on Supramolecular Host-Guest Interaction for High-Performance...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) suffer from intrinsic instability due to ion migration.
• This instability limits their commercial viability and long-term performance.

Purpose of the Study:

• To develop a universal strategy for suppressing ion migration in PSCs.
• To enhance the stability and efficiency of perovskite-based photovoltaics.

Main Methods:

• Incorporation of 4-tert-butylcalix[8]arene (C8A) supramolecules to form host-guest complexes.
• Simultaneous suppression of multiple mobile chemical species migration.
• Passivation of interfacial defects and promotion of charge transport.

Main Results:

• Achieved record power conversion efficiency (PCE) of 26.01% for TiO2-based planar PSCs and 27.18% for inverted PSCs.
• Demonstrated remarkable operational stability, retaining 95% PCE after 1015 hours.
• Successfully passivated interfacial defects and improved hole extraction and transport.

Conclusions:

• Calixarene-based supramolecules offer an effective approach to stabilize PSCs.
• This strategy addresses intrinsic instability, paving the way for efficient and durable perovskite optoelectronics.