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

被引：20

作者：

Kim, Sohee ^{[1
,2
]}

Kim, Aryeon ^{[1
]}

Jang, Kwang-Suk ^{[3
]}

Yoo, Sungmi ^{[1
]}

Ka, Jae-Won ^{[1
]}

Kim, Jinsoo ^{[1
]}

Yi, Mi Hye ^{[1
]}

Won, Jong Chan ^{[1
]}

Hong, Sung-Kwon ^{[2
]}

Kim, Yun Ho ^{[1
]}

机构：

[1] Korea Res Inst Chem Technol, Div Adv Mat, Daejeon 34114, South Korea

[2] Chungnam Natl Univ, Dept Polymer Sci & Engn, Daejeon 34134, South Korea

[3] Hankyong Natl Univ, Dept Chem Engn, Anseong 17579, South Korea

来源：

SYNTHETIC METALS | 2016年 / 220卷

关键词：

Organic semiconductor; Liquid crystal; Thermal annealing; Organic field-effect transistor; Polyimide gate insulator; THIN-FILM TRANSISTORS; FIELD-EFFECT TRANSISTORS; ELECTRICAL PERFORMANCE; SURFACE; MORPHOLOGY; INTERLAYER; MOBILITY; DEFECTS;

D O I：

10.1016/j.synthmet.2016.06.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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-C-10), 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-C-10 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 degrees C) and SmA (over 213 degrees C) liquid crystalline phase temperature, respectively. The OFET using bilayer-structured thin film showed high performance with a mobility of 2.27 cm(2)/Vs. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：311 / 317

页数：7

共 13 条

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