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

Why It Matters

The breakthrough enables durable, high‑efficiency flexible photovoltaics, accelerating wearable electronics and large‑scale commercialization of perovskite technology.

Key Takeaways

• In‑situ polymer binder reduces microscopic strain, improves crystal quality
• Gel‑like layer dissipates macroscopic stress, enhances bendability
• Flexible PSCs reach 20.32% efficiency, 90% after 10k bends
• Adhesion to SnO₂ increases, preventing delamination
• Dual‑scale strain control enables low‑temperature solution processing

Pulse Analysis

The new adhesive strategy tackles a long‑standing hurdle for perovskite photovoltaics: strain‑induced degradation. By embedding a polymer network during film formation, researchers create a viscous medium that slows ion migration, allowing perovskite crystals to grow larger and with fewer defects. This microscopic control directly translates into higher open‑circuit voltage and fill factor, pushing rigid cell efficiencies beyond 23%, a benchmark that rivals traditional silicon modules.

Beyond crystal quality, the cross‑linked polymer forms a soft, gel‑like interlayer that adheres strongly to the underlying SnO₂ electron transport layer. Its low Young’s modulus acts as a mechanical buffer, absorbing bending stresses that would otherwise cause cracking or delamination. The result is a flexible device that endures 10,000 bending cycles while maintaining over 90% of its initial power conversion efficiency, a performance level previously seen only in laboratory‑scale prototypes.

Commercial implications are significant. The process operates at low temperatures and uses solution‑based deposition, compatible with roll‑to‑roll manufacturing and existing flexible substrate lines. As wearable sensors, medical patches, and IoT devices demand reliable on‑board power, these robust, high‑efficiency perovskite cells could replace bulkier batteries or rigid solar panels. Moreover, the dual‑scale strain regulation concept may be adapted to other thin‑film technologies, broadening its impact across the renewable energy sector.