Molecularly Engineered Self-Healing Scaffold With Customized Dynamic Bonds Enable Stable and Scalable Flexible...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Organometallic halide perovskites are promising for high-performance flexible perovskite solar cells (f-PSCs).
• Achieving uniform, crystalline, and mechanically robust perovskite films is a key challenge for f-PSCs.

Purpose of the Study:

• To develop a method for improving perovskite film quality and mechanical stability in f-PSCs.
• To enhance the performance and durability of flexible perovskite solar cells through in-situ film modification.

Main Methods:

• Incorporation of a tandem dynamic bond-based monomer (ADM) into perovskite films.
• In-situ cross-linking of ADM to control nucleation and crystallization.
• Multi-modal passivation using Lewis-base coordination and hydrogen bonding.

Main Results:

• ADM enables instantaneous self-curing of flexible perovskite films at 40°C.
• Champion rigid PSCs achieved 27.12% PCE (certified 26.80%).
• Flexible minimodules (10.24 cm²) reached 20.00% PCE.
• Large-area (655.2 cm²) submodules achieved a record 21.60% PCE (certified 20.37%).
• Devices maintained over 91% PCE after 10,000 bending cycles due to self-healing.

Conclusions:

• The ADM strategy effectively controls perovskite crystallization and provides multi-modal passivation.
• The self-healing capability of ADM-modified films significantly enhances mechanical endurance.
• This approach demonstrates excellent scalability and potential for high-performance, durable f-PSCs.