Stabilizing Stretchable Organic Transistors Through Small‐Molecule Additive Blending for Ultra‐Sensitive Pesticide Detection

Intrinsically stretchable organic field-effect transistors (OFETs) have emerged as a promising platform for real-time, wearable sensing. However, achieving high charge carrier mobility while ensuring long-term stability under extreme deformation remains a critical challenge. Herein, a stabilization strategy employing 2,4,5,7-tetranitrofluorenone (TeNF) as a water-displacing additive in indacenodithiophene-co-benzothiadiazole (IDTBT) polymer semiconductor is demonstrated. Thermodynamically favored TeNF-polymer interactions selectively exclude ambient moisture from nanoscale voids, achieving dual enhancement in mobility (3.50 cm² Vs^-1) and environmental stability. The fully stretchable transistors maintain ideal electrical characteristics under 100% strain and after 60 days of ambient storage. Furthermore, by integrating an extended-gate configuration, highly sensitive and precise detection of chlorpyrifos pesticide is achieved, reaching a detection limit as low as 0.032 ppb and a fast response time of 6.4 s toward 1 ppb chlorpyrifos. These results pave the way for next-generation stretchable organic transistors with enhanced reliability for advanced sensing applications.