Visible Light-Triggered Self-Welding Perovskite Solar Cells and Modules

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Flexible perovskite solar cells (F-PSCs) offer promising lightweight, cost-effective energy solutions.
• Mechanical instability and degradation limit the practical application of current F-PSCs.
• Developing robust F-PSCs is crucial for their integration into mobile and stationary power systems.

Purpose of the Study:

• To enhance the long-term stability and mechanical robustness of flexible perovskite solar cells.
• To introduce a self-welding dynamic diselenide component into the perovskite structure.
• To improve the crack and defect repair capabilities within the absorber layer of F-PSCs.

Main Methods:

• Incorporation of self-welding dynamic diselenide into the Cs$_{0.05}$MA$_{0.05}$FA$_{0.9}$PbI$_{3}$ perovskite layer.
• Visible light triggering of the self-welding mechanism for in-situ repair.
• Mechanical testing involving repeated bending cycles to assess durability.

Main Results:

• Optimized F-PSCs achieved a power conversion efficiency (PCE) of 24.85%.
• Devices retained approximately 92% of their initial efficiency after 15,000 bending cycles at a 3 mm curvature radius.
• A large-scale flexible module (15.82 cm$^2$) demonstrated a record PCE of 21.65%.

Conclusions:

• The self-welding dynamic diselenide effectively enhances the flexibility and long-term stability of F-PSCs.
• This approach addresses key mechanical limitations, enabling more reliable flexible solar energy devices.
• The developed technology shows significant potential for next-generation portable and wearable electronics.