Publication date: 15th December 2025
Flexible perovskite solar cells (f-PSCs) require simultaneously high optoelectronic quality and mechanical robustness, yet achieving both remains challenging due to defect-mediated non-radiative recombination and crack formation under strain. Here, we introduce a novel additive to enhance both radiative efficiency and mechanical durability in flexible perovskite devices. Incorporating a novel additive results in improved film homogeneity and a modest increase in grain size. Steady-state PL and PLQY measurements reveal nearly a threefold enhancement in radiative recombination efficiency, directly correlating with the increase in device VOC. Despite similar ionic densities confirmed by rapid hysteresis and BACE measurements, the novel additive-modified devices exhibit moderately improved operational stability, attributed primarily to morphological improvements rather than ionic effects. Fully encapsulated f-PSCs with polymer maintain 85% of their initial PCE after 10,000 bending cycles, compared to only 38% for the control. Notably, we report, for the first time, in situ J–V measurements performed during active bending, revealing catastrophic FF and Jsc losses in the control, while novel additive-based devices remain largely intact. Overall, this work demonstrates that additive engineering simultaneously enhances radiative efficiency and mechanical resilience, offering a simple and effective pathway toward durable, high-performance flexible perovskite solar cells.
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