Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (6): 1266-1274.doi: 10.1007/s40242-024-4106-5

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Dithieno[3,2-c: 3',2'-h][2,6]naphthyridine-4,9(5H,10H)-dione-based Quinoidal Small Molecules: Synthesis, Properties, and Optoelectronic Applications

SU Yunran1, ZHAO Lingxu2, ZHANG Shengnan1, CHEN Jiawei1, LI Yanru1, JIANG Ting2, LI Jie2, JI Deyang2, LI Liqiang2, FEI Zhuping1,3   

  1. 1. Institute of Molecular Plus, Tianjin University, Tianjin 300072, P. R. China;
    2. Institute of Molecular Aggregation Science, Key Laboratory of Organic Integrated Circuits, Ministry of Education, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China;
    3. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, P. R. China
  • Received:2024-04-24 Online:2024-12-01 Published:2024-10-26
  • Contact: LI Jie,lijie2018@tju.edu.cn;FEI Zhuping,zfei@tju.edu.cn E-mail:lijie2018@tju.edu.cn;zfei@tju.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (No. 2018YFA0703200), the National Natural Science Foundation of China (Nos. 21975176, 52121002), the Seed Foundation of Tianjin University, China (No. 2024XJD-0058), and the Fund of the Haihe Laboratory of Sustainable Chemical Transformations, China.

Abstract: Amide and imide groups have been widely used in the design of organic semiconductors, and the development of new structure semiconductors based on these functional groups is of great interest to further improve the performance of organic electronic devices. Herein, we designed and synthesized two novel 5,10-dihydrodithieno[3,2-c:3',2'-h][2,6]naphthyridine-4,9-dione (TVTDA) based quinoidal molecules with different side chains, TVTDA-CN-EH and TVTDA-CN-OD. Both molecules showed the deep lowest unoccupied molecular orbital (LUMO) and the deep highest occupied molecular orbital (HOMO) energy levels and strong absorption in the long wavelength region. Organic field-effect transistors (OFETs) based on TVTDA-CN-EH and TVTDA-CN-OD exhibited unipolar n-type electron transport behavior with mobilities of 0.04 and 0.0064 cm2·V-1·s-1, respectively. TVTDA-CN-EH with shorter alkyl side chains demonstrated better electron transport properties, which is attributed to the larger grain size in the film to facilitate charge transport. Furthermore, organic phototransistors (OPTs) based on TVTDA-CN-EH film showed good photo detection property from red light to near infrared region. Our work provides a new idea for the design and synthesis of organic semiconductors, especially for n-type organic semiconductors with photoresponse in the long wavelength.

Key words: Organic field-effect transistor, Organic phototransistor, Amide, Quinoidal, Semiconductor