Unlocking 27.3% Perovskite Solar Cells and Ultra-Stable Flexible Modules via Multidentate Molecular-Mediated...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) face challenges with interfacial disorder, limiting performance and stability.
• The NiO_x/self-assembled monolayer (SAM) interface is a critical area for improvement in inverted PSCs.

Purpose of the Study:

• To develop a novel strategy for buried-interface reconstruction in inverted PSCs.
• To address chemical and electronic disorder at the NiO_x/SAM interface.
• To enhance the efficiency and long-term stability of PSC devices.

Main Methods:

• Utilized a bisphosphonate molecular mediator for interfacial reconstruction.
• Engineered a multidentate molecular framework to passivate defects and coordinate interfaces.
• Investigated the impact of the engineered interface on carrier dynamics and recombination.

Main Results:

• Achieved champion-certified efficiencies of 27.31% (rigid PSCs), 24.52% (flexible devices), and 17.11% (large-area flexible modules).
• Demonstrated exceptional durability with flexible modules retaining over 94% power after 3250 hours.
• Successfully passivated NiO_x defects, regulated SAM assembly, and coordinated perovskite interfaces.

Conclusions:

• The multidentate molecular-mediated interface reconstruction is a scalable and versatile strategy for PSCs.
• This approach significantly enhances both the efficiency and operational stability of flexible and large-area perovskite solar cells.
• Paves the way for developing high-performance, ultra-stable flexible photovoltaic technologies.