High‐Performance Aza‐Coronene‐Based Organic Semiconductors for Thin‐Film Transistors and Ultrasensitive Herbicide Detection

The rapid intensification of agricultural activities has necessitated the development of ultrasensitive platforms for monitoring herbicide runoff in food and water systems. This study reports the rational design, synthesis, and characterization of a novel series of hexabenzo-aza-coronene (HBAC) derivatives (5a-f) featuring a triindolo benzo-fused coronene skeleton, synthesized via a strategic photo-electrocatalytic approach. These polycyclic aromatic hydrocarbons (PAHs) exhibit extensively delocalized π-electron systems, facilitating high-performance charge transport and tunable optoelectronic properties. By integrating these HBAC derivatives into a surface-modified top-gate (TG) organic thin-film transistor (OTFT) architecture, we establish a robust sensing platform that leverages the dual advantages of intrinsic signal amplification and specific molecular recognition. This work provides deep insights into the structure-property relationships of aza-coronene systems and demonstrates a transformative "Lab-on-a-Chip" approach for the real-time, high-precision detection of trace chemical contaminants in complex environmental matrices.