| 초록 |
Despite high carrier mobility of the poly[(5-fluoro-2,1,3-benzothiadiazole-4,7-diyl)(4,4-dihexadecyl-4H-cyclopenta[2,1-b:3,4-b’]dithiophene-2,6-diyl)(6-fluoro-2,1,3-benzothiadiazole-4,7-diyl)(4,4-dihexadecyl-4H-cyclopenta[2,1-b:3,4-b’]dithiophene-2,6-diyl)] (PCDTFBT) polymer, poor operational stability of organic field-effect transistors (OFETs) with the PCDTFBT remains one of the serious problems. Here, we introduce highly stable OFETs with the PCDTFBT during operation by modifying device architecture. The OFETs without a self-assembled monolayer (SAM) show hysteresis-free transistor characteristics in a wide range of gate bias sweeping compared to the devices with the DTS SAM. In addition, the devices without the DTS SAM show lowered off current, thereby increasing on/off current ratio of the devices. These results imply that the DTS molecule leads to accumulation of electrons in the FET channel and induce device instability during operation of PCDTFBT devices. |
