Synergistic Interface Stabilization and Dynamic Defect Passivation for High-Performance Ultraviolet-Stable Perovskite...

Area of Science:

• Materials Science
• Photovoltaics
• Chemistry

Background:

• Perovskite solar cells (PSCs) face stability challenges due to UV-induced degradation, involving perovskite defect accumulation and interface deterioration.
• Existing PSCs suffer from simultaneous photoinduced defects and buried interface degradation under illumination, limiting their operational lifetime.

Purpose of the Study:

• To develop a synergistic stabilization strategy for inverted PSCs by combining dynamic perovskite defect regulation and buried-interface reinforcement.
• To enhance the long-term stability and efficiency of PSCs against UV degradation and operational stress.

Main Methods:

• Employed a photoisomerizable molecule (TIBBP) for dynamic perovskite defect passivation, transitioning between closed and open forms to manage defects during device operation.
• Designed a UV-durable self-assembled monolayer (SAM), F-PhPACZ, to reinforce the buried ITO/SAM/perovskite interface against UV stress.
• Investigated the synergistic effects of bulk defect regulation and interface reinforcement on PSC performance and stability.

Main Results:

• Achieved a certified power conversion efficiency of 26.65% for the inverted PSC.
• Demonstrated markedly improved stability under UV irradiation, air exposure, and thermal aging compared to conventional PSCs.
• Successfully suppressed both perovskite defect evolution and buried-interface degradation through the synergistic stabilization strategy.

Conclusions:

• The developed bulk/interface synergistic stabilization strategy effectively enhances the efficiency and stability of inverted PSCs.
• Dynamic defect regulation and interface reinforcement offer a promising pathway for overcoming UV-induced degradation in perovskite photovoltaics.
• This approach provides a device-failure-pathway-oriented solution for realizing efficient and durable perovskite solar cells.