应用化学 ›› 2023, Vol. 40 ›› Issue (7): 1054-1060.DOI: 10.19894/j.issn.1000-0518.230082

• 研究论文 • 上一篇    

烷基链长度对非对称含噻吩五元稠环化合物传输性能的影响

李骅峰1,2, 李伟利1, 田洪坤1,2(), 王利祥1,2   

  1. 1.中国科学院长春应用化学研究所,高分子物理与化学国家重点实验室,长春 130022
    2.中国科学技术大学,合肥 230026
  • 收稿日期:2023-03-31 接受日期:2023-06-07 出版日期:2023-07-01 发布日期:2023-07-19
  • 通讯作者: 田洪坤
  • 基金资助:
    国家自然科学基金(22075273)

Influence of Alkyl Chain Length on the Transport Properties of Asymmetric Five-ring-fused Thienoacenes

Hua-Feng LI1,2, Wei-Li LI1, Hong-Kun TIAN1,2(), Li-Xiang WANG1,2   

  1. 1.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.University of Science and Technology of China,Hefei 230026,China
  • Received:2023-03-31 Accepted:2023-06-07 Published:2023-07-01 Online:2023-07-19
  • Contact: Hong-Kun TIAN
  • About author:hktian@ciac.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(22075273)

摘要:

含噻吩并苯类分子是一类代表性的高迁移率有机半导体材料,以其为共轭骨架构建的不对称分子在薄膜中倾向于形成双层排列结构,并以二维层状方式生长,有利于实现高迁移率。烷基取代基的长度会对有机半导体材料的堆积形貌产生影响。本文设计合成了不同长度烷基链取代的噻吩并[4,5-b][1]苯并噻吩并[3,2-b][1]苯并噻吩(syn-BTBTT-Cnn=4,5,6,7,8,10),系统研究了烷基链长度对化合物热稳定性、能级、载流子传输能力、堆积结构和薄膜形貌等方面的影响。结果表明,所有化合物均不具备液晶性,热稳定性良好。在所制备的蒸镀薄膜中所有分子均形成双层堆积结构,共轭核在层内形成鱼骨架堆积,烷基链长度会影响薄膜的有序度和堆积的紧密程度。基于该类材料制备的有机薄膜晶体管(OTFT)器件的迁移率都超过7.0 cm2/(V·s),其中syn-BTBTT-C8分子的迁移率最高可达13.8 cm2/(V·s),平均值为12.5 cm2/(V·s)。

关键词: 含噻吩并苯类分子, 非对称结构, 有机薄膜晶体管, 迁移率

Abstract:

Thienoacenes are a representative class of high mobility organic semiconductor materials (OSCs). Asymmetric molecules based on them tend to form a bilayer arrangement in thin films and grow in a two-dimensional layer-like manner, which has the advantage of achieving high mobility. The length of the alkyl substituents affects the packing microstructure of OSCs. Herein, thieno[4,5-b][1]benzothieno[3,2-b][1]benzothiophenes substituted with different lengths of alkyl chains (syn-BTBTT-Cnn=4,5,6,7,8,10) are designed and synthesized to systematically investigate the effects of lengths of alkyl chains on their thermal stability, energy levels, charge carrier transport capabilities, packing structures and film morphologies. All compounds are thermally stable and do not have liquid crystalline behaviors. All molecules in the vacuum-deposited films form a bilayer arrangement, within the conjugated cores forming a herringbone packing motif, and the alkyl chain length affects the film order and the tightness of the packing. Organic thin. film transistors devices all exhibit mobilities beyond 7.0 cm2/(V·s). Among them, the syn-BTBTT-C8 devices show a mobility of up to 13.8 cm2/(V·s) with the average values of 12.5 cm2/(V·s).

Key words: Thienoacenes, Asymmetric structure, Organic thin-film transistors, Mobility

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