Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 12, Pages 5641-5646Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16007b
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Funding
- Converging Research Center through the Ministry of Education, Science and Technology, Republic of Korea [2010K001064]
- National Research Council of Science & Technology (NST), Republic of Korea [B551179-09-06-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-50171, 핵06A2804] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We herein present results obtained from our study of flat and uniform polymer-blended small-molecular semiconductor thin films. These films were produced for organic thin film transistors (OTFTs), using a simple pre-metered horizontal dipping process. The organic semiconductor thin films were composed of a small molecular 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-PEN) composite blended with a polymer binder of poly(alpha-methylstyrene) (PaMS). We show that the premetered solution-coating process allowed the critical control of the thickness of the TIPS-PEN: PaMS film; extremely thin films could be produced using the downstream meniscus of the solution at high speeds (of the order of a few metres per minute). The fabricated TIPS-PEN: PaMS OTFTs exhibited a maximum field-effect mobility of 0.22 cm(2) V-1 s(-1), and on/off ratios of over 10(5), that were consistently superior to those of conventional spin-cast devices. These results demonstrate that horizontal dipcoated TIPS-PEN: PaMS films show considerable promise for the production of reliable, reproducible, high-performance OTFTs.
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