期刊
CHEMISTRY OF MATERIALS
卷 26, 期 6, 页码 2147-2154出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm4042346
关键词
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资金
- National Research Foundation (NRF), Korea [2012R1A1A2005855, 2013M3C1A3065522, NRF-2009-0079630]
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Education, Science and Technology, Korea [2011-0031639]
- New and Renewable Energy Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korea government Ministry of Trade, industry Energy [20113010010030]
- National Research Foundation of Korea [2011-0031639, 2013M3C1A3065522, 2012R1A1A2005855, 2014H1A2A1021859, 10Z20130000004] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We report a series of benzotriazole-based semicrystalline pi-conjugated polymers with noncovalent conformational locks for applications in polymer field-effect transistors. The benzotriazole moiety is a versatile electron-deficient building block that offers two chemically functionalizable sites, 2(N) and 5, 6(C) positions,. allowing easy modulation of the solution processability and electronic structures of the resulting polymers. Fluorine or alkoxy substituents were introduced to the benzotriazole unit to enhance the molecular ordering through intra- and intermolecular F center dot center dot center dot S, F center dot center dot center dot H-C, C-F center dot center dot center dot pi(F), or S center dot center dot center dot O attractive interactions. The fluorinated polymer (PTBTz-F) showed remarkably enhanced hole mobility (mu(h) = 1.9 cm(2)/(V.S), on/off ratio = 8 x 10(7)) upon thermal annealing at 305 degrees C, compared to the unsubstituted one (PTBTz) (mu(h) = 7.0 x 10(-3) cm(2)/(V.s), on/off ratio = 3 x 10(6)). Alkoxy unit substitution (PTBTz-OR) also improved the carrier mobility up to 0.019 cm(2)/(V.s) with an on/off ratio of 4 x 10(5). Fluorine or alkoxy substitution induced tight interchain ordering with edge-on orientation, as confirmed by X-ray diffraction measurements. In particular, fluorinated PTBTz-F showed high thermal stability (T-d 453 degrees C) and the remarkable device characteristics with deep frontier orbital levels.
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