[논문]The effect of thermal annealing on the layered structure of smectic liquid crystalline organic semiconductor on polyimide gate insulator and its OFET performance

Kim, Sohee; Kim, Aryeon; Jang, Kwang-Suk; Yoo, Sungmi; Ka, Jae-Won; Kim, Jinsoo; Yi, Mi Hye; Won, Jong Chan; Hong, Sung-Kwon; Kim, Yun Ho

doi:10.1016/j.synthmet.2016.06.021

[해외논문] The effect of thermal annealing on the layered structure of smectic liquid crystalline organic semiconductor on polyimide gate insulator and its OFET performance

Synthetic metals, v.220, 2016년, pp.311 - 317

Kim, Sohee (Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea) , Kim, Aryeon (Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea) , Jang, Kwang-Suk (Department of Chemical Engineering, Hankyong National University, Anseong 17579, Republic of Korea) , Yoo, Sungmi (Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea) , Ka, Jae-Won (Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea) , Kim, Jinsoo (Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea) , Yi, Mi Hye (Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea) , Won, Jong Chan (Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea) , Hong, Sung-Kwon (Department of Polymer Science and Engineering, Chungnam National University, Daejeon 34) , Kim, Yun Ho

Abstract ▼ AI-Helper

Abstract The electrical performance of organic field-effect transistors (OFETs) depends on the quality of thin-film organic semiconductors, which is significantly affected by solution-processing conditions and additional processes. We investigated the effects of post-thermal annealing on the thin-film morphologies of liquid crystalline organic semiconductors on polyimide gate insulator surface and the FET performances of the films. The active material selected for the OFETs was 2-decyl-7-phenyl-[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-C10), which shows a highly ordered smectic E (SmE) mesophase and polycrystalline thin films feature very high mobility. We aimed to produce well defined molecular orientation and crystal structure in thin-film Ph-BTBT-C10 on polyimide gate insulator not typical SiO2 gate insulator via thermal annealing process. Uniform bilayer- or monolayer-structured polycrystalline thin films were obtained on polymer gate insulator after thermal annealing at a SmE (over 148°C) and SmA (over 213°C) liquid crystalline phase temperature, respectively. The OFET using bilayer-structured thin film showed high performance with a mobility of 2.27cm2/Vs. Highlights The thermal annealing of liquid crystalline OSC affects the performance of OFET. The thin-film morphology of OSC was changed during thermal annealing. Uniform bilayer-structured polycrystalline thin films were obtained after thermal annealing. A highly ordered smectic mesophase and polycrystalline thin films feature high mobility. Graphical abstract The effect of thermal annealing of liquid crystalline organic semi-conductor on the thin film morphology and its electrical performance of OFETs. [DISPLAY OMISSION]

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[해외논문] The effect of thermal annealing on the layered structure of smectic liquid crystalline organic semiconductor on polyimide gate insulator and its OFET performance

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