Modulate Stresses for Efficient Full-Air Processed Flexible Perovskite Solar Cells with Polymer Adhesive.

Area of Science:

• Materials Science
• Energy Science
• Nanotechnology

Background:

• Flexible perovskite solar cells (FPSCs) are crucial for wearable electronics due to their high efficiency and solution-processability.
• Strain at micro- and macro-scales negatively impacts FPSC performance and durability.
• Existing methods struggle to mitigate these dual-scale strain issues effectively.

Purpose of the Study:

• To develop a novel in-situ polymerized adhesive polymer binder for FPSCs.
• To concurrently regulate strain distribution at both microscopic and macroscopic scales.
• To enhance the photovoltaic performance and long-term stability of flexible perovskite solar cells.

Main Methods:

• An "AB" adhesive polymer binder was synthesized and polymerized in-situ.
• The polymer binder was integrated into the perovskite film structure.
• Microscopic and macroscopic strain regulation mechanisms were investigated.
• Interfacial adhesion and mechanical properties were characterized.

Main Results:

• The polymer binder created a viscous micro-environment, promoting high-quality perovskite crystallization and reducing intrinsic strain.
• A cross-linked gel-like layer dissipated stress, enhanced film toughness, and reduced defects.
• Interfacial adhesion between the perovskite and SnO2 layers was significantly improved.
• Rigid and flexible PSCs achieved power conversion efficiencies of 23.57% and 20.32%, respectively.
• The flexible device maintained over 90% of its initial efficiency after 10,000 bending cycles.

Conclusions:

• The "AB" adhesive polymer binder effectively addresses dual-scale strain issues in FPSCs.
• This dual-scale strain regulation strategy significantly improves device efficiency and mechanical robustness.
• The developed method offers a promising pathway for commercializing durable, high-performance FPSCs for wearable applications.