TY - JOUR
T1 - An Ultrahigh Mobility in Isomorphic Fluorobenzo[c][1,2,5]thiadiazole-Based Polymers
AU - Lee, Junghoon
AU - Kang, So Huei
AU - Lee, Sang Myeon
AU - Lee, Kyu Cheol
AU - Yang, Heesoo
AU - Cho, Yongjoon
AU - Han, Daehee
AU - Li, Yongfang
AU - Lee, Byoung Hoon
AU - Yang, Changduk
N1 - Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/10/8
Y1 - 2018/10/8
N2 - 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 cm2 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.
AB - 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 cm2 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.
KW - cyclopentadithiophene
KW - fluoro-benzothiadiazole
KW - organic field-effect transistors
KW - polymer chemistry
KW - regioregularity
UR - http://www.scopus.com/inward/record.url?scp=85053444815&partnerID=8YFLogxK
U2 - 10.1002/anie.201808098
DO - 10.1002/anie.201808098
M3 - Article
C2 - 30133093
AN - SCOPUS:85053444815
SN - 1433-7851
VL - 57
SP - 13629
EP - 13634
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 41
ER -