Resonance-Mediated Dynamic Modulation of Perovskite Crystallization for Efficient and Stable Solar Cells.

Area of Science:

• Materials Science
• Photovoltaics
• Chemistry

Background:

• High-quality perovskite films are crucial for efficient and stable perovskite solar cells (PSCs).
• Controlling perovskite crystallization is key to achieving desired film properties.

Purpose of the Study:

• To develop a dynamic strategy for modulating perovskite crystallization using a novel hole-transporting material (HTM).
• To enhance the quality, efficiency, and stability of perovskite solar cells (PSCs).

Main Methods:

• A resonance HTM capable of fast self-adaptive tautomerization was employed.
• The HTM mediated perovskite crystal growth and defect passivation in situ.
• The strategy utilized resonance variation and self-adaptive molecular interactions between HTM and perovskite.

Main Results:

• High-quality perovskite films with smooth surfaces and oriented crystallization were produced.
• Low charge recombination and high performance were achieved in inverted PSCs.
• Power conversion efficiencies reached ~22% for small-area (0.09 cm²) and 19.5% for large-area (1.02 cm²) devices.

Conclusions:

• The dynamic HTM strategy effectively modulates perovskite crystallization for high-performance PSCs.
• PSCs demonstrated remarkable stability, retaining over 83% efficiency after 1000 hours under various stress conditions without encapsulation.
• This approach offers a promising route for developing efficient and stable perovskite solar cells.