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Fluorinated Head‐to‐Head Dialkoxybithiophene: A New Electron‐Donating Building Block for High‐Performance Polymer Semiconductors
Author(s) -
Huang Jun,
Guo Han,
Uddin Mohammad Afsar,
Yu Jianwei,
Woo Han Young,
Guo Xugang
Publication year - 2018
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201700519
Subject(s) - materials science , solubility , monomer , polymerization , polymer , organic semiconductor , organic electronics , polymer chemistry , organic chemistry , transistor , optoelectronics , chemistry , physics , quantum mechanics , voltage , composite material
New building blocks with good solubility and optimized optoelectrical property are critical for materials development in organic electronics. Herein, a new head‐to‐head linkage containing a donor unit, 4,4′‐difluoro‐3,3′‐dialkoxy‐2,2′‐bithiophene (BTfOR), is synthesized. The dialkoxy chains afford good materials solubility and also planar backbone via noncovalent (thienyl)S⋯(alkoxy)O interactions. Compared to the reported 3,3′‐dialkoxy‐2,2′‐bithiophene (BTOR), F addition leads to BTfOR with lower‐lying frontier molecular orbitals and can further promote polymer packing via additional F⋯S or F⋯H interactions. BTfOR can be readily stannylated to afford tin monomer with high purity and excellent reactivity toward Stille polymerization. As a proof of concept for materials design, BTfOR‐based homopolymer ( PBTfOR ) is synthesized, showing high molecular weight and strong aggregation. Moreover, the HOMO (−4.98 eV) of PBTfOR is greatly lower than that (−4.54 eV) of nonfluorinated counterpart PBTOR , which is attributed to the addition of F atoms. When incorporated into thin‐film transistors, PBTfOR exhibits a remarkable hole mobility of 0.57 cm 2 V −1 s −1 , showing an exceptional example of high‐mobility head‐to‐head polythiophene. This study demonstrates that introduction of F atoms can lead to BTfOR with optimized physicochemical properties, and the new BTfOR should find promising use for constructing donor–acceptor copolymers for high‐performance electronic devices.