Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 23, Issue 46, Pages 5719-5727Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201301197
Keywords
organic field-effect transistors; conjugated polymers; air-stability; extended -conjugation
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Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012047047, 2012049647]
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the MEST [2012055225, 2011-0031639]
- Dongguk University
- National Research Foundation of Korea [2012M3A6A5055225, 2012M3A7B4049645, 2011-0031639] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A high-performance naphthalene diimide (NDI)-based conjugated polymer for use as the active layer of n-channel organic field-effect transistors (OFETs) is reported. The solution-processable n-channel polymer is systematically designed and synthesized with an alternating structure of long alkyl substituted-NDI and thienylene-vinylene-thienylene units (PNDI-TVT). The material has a well-controlled molecular structure with an extended -conjugated backbone, with no increase in the LUMO level, achieving a high mobility and highly ambient stable n-type OFET. The top-gate, bottom-contact device shows remarkably high electron charge-carrier mobility of up to 1.8 cm(2) V-1 s(-1) (I-on/I-off = 10(6)) with the commonly used polymer dielectric, poly(methyl methacrylate) (PMMA). Moreover, PNDI-TVT OFETs exhibit excellent air and operation stability. Such high device performance is attributed to improved - intermolecular interactions owing to the extended -conjugation, apart from the improved crystallinity and highly interdigitated lamellar structure caused by the extended - backbone and long alkyl groups.
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