A Diammonium-Based Non-Dion-Jacobson Phase 2D Perovskite With High Durability for Efficient and Stable 2D/3D...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photovoltaics

Background:

• Dion-Jacobson (DJ) phase 2D perovskites offer enhanced stability over 3D counterparts.
• Organic diammoniums are typically believed to form DJ 2D perovskites via bilateral hydrogen bonds.

Purpose of the Study:

• To report a novel diammonium-based non-DJ phase 2D perovskite.
• To investigate the structural and stability properties of this new material.
• To evaluate its performance in perovskite solar cells and modules.

Main Methods:

• Single-crystal X-ray diffraction to determine the crystal structure.
• Fabrication of 2D/3D perovskite solar cells and modules.
• Device performance testing under continuous maximum power point tracking.

Main Results:

• A new non-DJ phase 2D perovskite, (3,3-MDPDA)PbI4, was synthesized and characterized.
• The structure features a unique organic bilayer with π-π interactions, enhancing stability.
• Perovskite solar cells achieved 26.52% efficiency, and modules reached 23.34% efficiency.
• Devices demonstrated excellent operational stability, retaining 94% efficiency after 1200 hours.

Conclusions:

• The study challenges conventional understanding of DJ phase formation in 2D perovskites.
• The novel non-DJ phase 2D perovskite exhibits superior stability and high photovoltaic performance.
• This material holds significant promise for advanced perovskite solar cell applications.