Chain Alignment and Film Crystallinity Manipulation Towards High-Performance Large-Area Printed Stretchable Electronics

• • Charge mobility reaches 6.11 cm2 V−1 s−1 at 0% strain and 2.98 cm2 V−1 s−1 at 100% strain, representing a 51% retention under full elongation. This performance exceeds most spin-coated stretchable conjugated polymers, enabling high-speed operation in wearable X-ray detectors and skin-like electronics where mechanical robustness and electrical stability are paramount. • • X-ray sensitivity of 1757.2 μC Gyair−1 cm−2 and an ultralow detection limit of 72.5 nGyair s−1 are achieved, surpassing commercial amorphous selenium detectors (typically ~1000 μC Gyair−1 cm−2 and >1000 nGyair s−1). This translates to lower patient radiation dose and higher imaging resolution in medical diagnostics, directly addressing clinical safety and cost barriers. • • The bar-coating process yields large-area films with low crystallinity but strong chain alignment, as confirmed by the formation of highly-aligned nanofiber networks within the elastomer phase. This morphology suppresses strain-induced cracking and maintains charge transport pathways, offering a scalable manufacturing route for roll-to-roll production of stretchable electronics. • • The film maintains X-ray imaging capability before and after stretching, with no reported degradation in sensitivity or detection limit. This operational stability under mechanical deformation is critical for implantable and wearable devices that undergo continuous movement, reducing the need for rigid encapsulation and enabling conformal integration.