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Development and Characterization of Solution‐Processable Dithieno[3,2‐b:2’,3’‐d]thiophene Derivatives with Various End‐capped Groups for Organic Field‐Effect Transistors

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In this paper, four organic materials based on the dithieno[3,2-b:2’,3’-d]thiophene (DTT) core structure with end-capping groups (phenyl and thienyl) and linker (acetylenic and olefinic) between DTT-core and end-capping groups were synthesized and characterized as solution-processable organic semiconductors (OSCs) for organic field-effect transistors (OFETs). Thermal properties, optical absorption spectra, and electrochemical properties of the corresponding materials were determined. Next, all DTT-derivatives were coated by solution-shearing method, and the thin-film microstructures and morphologies were investigated. To investigate the electrical performance of four newly synthesized DTT-derivatives, bottom-gate/top-contact OFETs were fabricated and characterized in ambient condition. It was found that substitution of acetylenic for olefinic linkers between DTT-cores and end-capping groups enhanced device performance. Especially, the resulting OFETs based on the compound containing phenylacetylene exhibited the highest hole mobility of 0.15 cm 2 /Vs and current on/off ratio of ~ 10 6 , consistent with film morphology and texture showing long range interconnected crystalline grains and strong diffraction peaks.

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