Ladder‐Like Difluoroindacenodithiophene‐4,9‐dione Derivative: A New Acceptor System for High‐Mobility n‐Type Polymer Semiconductors

• DOI: 10.1002/adfm.202210846
• Publication Date: 2022-11-28T04:17:02Z
• Authors: Xin Tao; Wenhao Li; Qingbo Wu; Huan Wei; Yongkun Yan; Lingli Zhao; Yuanyuan Hu; Yan Zhao; Huajie Chen; Yunqi Liu
• Keywords: Acceptor; Electron Mobility; Electron acceptor; Organic semiconductor; HOMO/LUMO

Abstract Ladder‐like aromatic diketones (LADK), which possess a coplanar π‐extended geometry, high electron deficiency as well various attractive optoelectronic properties, are demonstrated the promising candidates in building small‐molecule organic electron‐transporting materials, yet reports on direct integration of these structural motifs into n‐type polymers rarely accessed. Herein, it is that possibility realizing unipolar characteristics such acceptor system by developing two novel donor–acceptor type polymers, newly developed LADK unit, named 3,8‐bis(2‐decyltetradecyl)‐5,10‐difluoro‐ s ‐indaceno[1,2‐ b :5,6‐ ′]dithiophene‐4,9‐dione (FIDTO‐R), adopted segments. The resulting present deep‐lying unoccupied molecular orbital levels (as low −3.84 eV), compact π–π stacking ( d ‐spacing, ≈3.57 Å) coupled with uniform nanofiber‐like surface morphology. All factors contribute to excellent mobilities 0.27 and 1.01 cm 2 V −1 , together inverter gain values 141 80, respectively. recorded among best polymer field‐effect transistors associated circuits. These findings unambiguously reveal as‐prepared FIDTO‐R its analog derivatives another blocks for construction high‐mobility polymers.