Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 41, Pages 13629-13634Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808098
Keywords
cyclopentadithiophene; fluoro-benzothiadiazole; organic field-effect transistors; polymer chemistry; regioregularity
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2018R1A2A1A05077194]
- Center for Advanced Soft-Electronics - Ministry of Science and ICT [2012M3A6A5055225]
- National Research Foundation of Korea (NRF) - Korea government [NRF-2017R1C1B5017966]
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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 nano-grooved 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.
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