Acceptor Unit for Organic Semiconductors and Organic Conductors

3,7-Dihydrobenzo[1,2-b:4,5-b']difuran-2,6-dione (1) is an electron acceptor unit that is recently being increasingly used. Polymers combining 1 with isatin derivatives have been reported to exhibit n-type semiconducting properties with an electron mobility exceeding 1 cm²V^-1s^-1 in air.¹⁾ Among them, F4BDOPV-2T shows an extremely high electron mobility of 14.9 cm²V^-1s^-1 in air.²⁾ Since these reports, the superiority of 1 as an acceptor unit has attracted attention, and various applications are being considered. For example, 2, obtained by polymerizing 1, is expected to be applied as a polymer material with excellent transparency and electrical conductivity.³⁾ In addition, organic thermoelectric materials with a power factor of 80 μWm^-1K^-2, which is among the highest for organic materials, have been realized by UFBDPPV with certain dopants.⁴⁾ Further material development using 1 as a raw material with high electron accepting capacity is expected in the future.

References

• 1) “Conformation Locked” Strong Electron-Deficient Poly(p-Phenylene Vinylene) Derivatives for Ambient-Stable n-Type Field-Effect Transistors: Synthesis, Properties, and Effects of Fluorine Substitution Position
  • T. Lei, X. Xia, J.-Y. Wang, C.-J. Liu, J. Pei, J. Am. Chem. Soc. 2014, 136, 2135.
• 2) Strong Electron-Deficient Polymers Lead to High Electron Mobility in Air and Their Morphology-Dependent Transport Behaviors
  • Y.-Q. Zheng, T. Lei, J.-H. Dou, X. Xia, J.-Y. Wang, C.-J. Liu, J. Pei, Adv. Mater. 2016, 28, 7213.
• 3) Highly Conductive and Solution-Processable n-Doped Transparent Organic Conductor
  • Z. Ke, A, Abtahi, J. Hwang, K. Chen, J. Chaudhary, I. Song, K. Perera, L. You, K. N. Baustert, K. R. Graham, J. Mei, J. Am. Chem. Soc. 2023, 145, 3706.
• 4) The Critical Role of Dopant Cations in Electrical Conductivity and Thermoelectric Performance of n-Doped Polymers
  • Y. Lu, Z.-D. Yu, Y. Liu, Y.-F. Ding, C.-Y. Yang, Z.-F. Yao, Z.-Y. Wang, H.-Y. You, X.-F. Cheng, B. Tang, J.-Y. Wang, J. Pei, J. Am. Chem. Soc. 2020, 142, 15340.

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