A thieno[3,2-c]pyridine-4,6-dione derived bisisoindigo for organic field-effect transistors

This work reports the synthesis and characterization of a bisisoindigo derivative (TPBIID) incorporating thieno[3,2-c]pyridine-4,6-dione subunits, and its corresponding donor–acceptor conjugated polymer (PTPBIID-BT). Their molecular geometries, optical properties, morphological features, and organic field-effect transistor mobilities were systematically investigated. Devices based on TPBIID exhibited balanced ambipolar charge transport properties, achieving optimal hole and electron mobilities of 0.011 cm² V⁻¹ s⁻¹ and 0.015 cm² V⁻¹ s⁻¹, respectively. In contrast, PTPBIID-BT-based devices displayed p-type-dominated ambipolar transport characteristics, with a maximum hole mobility of 0.16 cm² V⁻¹ s⁻¹. This study demonstrates the potential of TPBIID as a novel fused-isoindigo building block for developing high-performance organic semiconductors.