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An Ultrahigh Mobility in Isomorphic Fluorobenzo[ c ][1,2,5]thiadiazole‐Based Polymers
Author(s) -
Lee Junghoon,
Kang SoHuei,
Lee Sang Myeon,
Lee Kyu Cheol,
Yang Heesoo,
Cho Yongjoon,
Han Daehee,
Li Yongfang,
Lee Byoung Hoon,
Yang Changduk
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201808098
Subject(s) - polymer , monomer , regioselectivity , materials science , substrate (aquarium) , electrochemistry , electron mobility , transistor , casting , combinatorial chemistry , nanotechnology , polymer chemistry , chemistry , optoelectronics , organic chemistry , electrode , catalysis , physics , composite material , oceanography , quantum mechanics , voltage , geology
To understand the effects rendered on the relevant basic physical properties and device function by controlling the regiochemistry of the cyclopenta[1,2‐b:5,4‐b′]dithiophene‐fluorobenzo[c][1,2,5]thiadiazole polymer (hereafter referred to as the CDT‐FBT polymer), two polymers, the regiorandom polymer (RA) and regioregular version (RR), respectively, are synthesized and characterized. In addition, an efficient route for synthesizing a key monomer for RR using various synthesis scope and optimizing the reaction conditions is discussed. Although RA exhibits optical, electrochemical, and morphological properties similar to RR, it shows better field‐effect transistor (FET) performance. Surprisingly, by employing a capillarity‐mediated sandwich‐casting process on a nanogrooved substrate, an unprecedented mobility of 17.8 cm 2 V −1 s −1 is obtained for RA‐based FETs; this mobility value is almost twofold greater than those of the corresponding RR‐based FETs. For the first time, this study challenges previously reported results in that high carrier mobility is related to the high degree of polymer order induced by the backbone regioregularity.