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

Abstract 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 cm ² 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.