Solution processable quinoxaline based molecular materials for organic field effect transistors

Three new solution processable quinoxaline based donor–acceptor–donor (D–A–D) type molecules have been synthesized for application in field effect transistors. These molecules were characterized by UV–visible spectroscopy, thermal gravimetric analysis, differential scanning calorimetry and cyclic voltammetry. DFT calculation gives deeper insight into the electronic structure of these molecules. The crystallinity and morphology features of thin film were investigated using X-ray diffraction. These molecules show liquid crystalline phase confirmed by DSC and optical polarizing microscopy. Investigation of their field effect transistor performance indicated that these molecules exhibited p-type mobility up to 9.7 × 10−4 cm2 V−1 s−1 and on/off ratio of 104.

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► Solution processable quinoxaline based organic semiconductors were synthesized.
► A detailed photophysical and DFT studies were performed to analyze the structure–property relation.
► These materials were studied for organic field-effect transistors applications.
► DSC and optical polarizing microscopy reveals the liquid crystalline properties of these materials.