期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 45, 页码 42403-42411出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12765
关键词
blade coating; crystal alignment; GIWAXS; NEXAFS; OFET
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A2C1009874]
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [20174030201760]
- National Research Foundation of Korea [2019R1A2C1009874] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A solution-printing technique that enables the patterning and aligning of organic semiconducting crystals is necessary for their practical application. Here, we report the facile growth of 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-PEN) semiconducting crystal patterns via a novel blade-coating technique. Defining low/high shearing-speed regions alternatively in a programmed manner enables the growth of TIPS-PEN crystals in low-speed regions and their patterning in high-speed regions. Various crystal-analysis tools, including polarized UV-vis absorption spectroscopy, grazing-incidence wide-angle X-ray scattering, and near-edge X-ray absorption fine structure, reveal that a crystal grown at an optimum shearing speed is highly oriented along the shearing direction with high crystallinity, and its molecules have a more edge-on orientation for efficient lateral-charge transport. As a result, organic field-effect transistors comprised of these crystals show a high field-effect mobility of up to 1.74 cm(2) /(V s). In addition, various crystal patterns can be created by simply changing the programming parameters, suggesting the broad utility of the crystal patterns and printing technique.
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