Effects of alkyl chain on the liquid crystalline properties of [1]benzothieno [3,2-b][1]benzothiophene-based organic semiconductors

被引：4

作者：

Park, Woobyung ^{[1
]}

Yun, Chaeyoung ^{[2
]}

Yun, Seungjae ^{[1
]}

Lee, Jae-Jin ^{[4
]}

Bae, Sangwok ^{[4
]}

Ho, Dongil ^{[1
]}

Kim, Choongik ^{[1
]}

Seo, SungYong ^{[2
,3
]}

机构：

[1] Sogang Univ, Dept Chem & Biomol Engn, 1 Shinsoo Dong, Seoul 04107, South Korea

[2] Pukyong Natl Univ, Dept Smart Green Technol Engn, Busan 48513, South Korea

[3] Pukyong Natl Univ, Dept Chem, Busan 48513, South Korea

[4] Kyung Hee Univ, Integrated Educ Inst Frontier Sci & Technol BK21, Dept Adv Mat Engn Informat & Elect, Gyeonggi Do 17104, South Korea

来源：

ORGANIC ELECTRONICS | 2022年 / 105卷

基金：

新加坡国家研究基金会;

关键词：

Organic thin film transistors; Organic semiconductor; Liquid crystal; Solution process; 1]benzothieno[3,2-b][1]benzothiophene; THIN-FILM TRANSISTORS; SIDE-CHAIN; HIGH-PERFORMANCE; HIGH-MOBILITY; POLYMER SEMICONDUCTORS; MOLECULAR SEMICONDUCTORS; PHOTOVOLTAIC PROPERTIES; BRANCHING POSITION; LENGTH; DERIVATIVES;

D O I：

10.1016/j.orgel.2022.106508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

New [1]benzothieno[3,2-b] [1]benzothiophene (BTBT)-based small molecules with different substituents were synthesized and employed as solution-processable organic semiconductors for organic thin-film transistors (OTFTs). Two types of alkyl side chains (octyl/ethylhexyl) were selected for the solubility enhancement and analysis of material phase transition. Thermal, optical, and electrical properties of new compounds were analyzed and characterized. Synthesized BTBT derivatives exhibited completely different phase transition features depending on the attached side chains; linearly alkylated 2-octyl-7-(5-octylthiophen-2-yl)benzo[b]benzo [4,5]thieno[2,3-d]thiophene (compound 1) showed decent carrier mobility up to 0.26 cm2/Vs at highly ordered smectic X phase, while 2-(5-(2-ethylhexyl)thiophen-2-yl)-7-octylbenzo[b]benzo [4,5]thieno[2,3-d]thiophene (compound 2) with branched alkyl chain showed poor electrical performance. Thin film morphology and microstructure were investigated using atomic force microscopy and X-ray diffraction to reveal the dramatic property difference between the two dialkylated BTBT derivatives.

引用

页数：8

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