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Solution-based patterned growth of rubrene nanocrystals for organic field effect transistors
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12.A solution of 1 mmol of dry silver perchlorate in a minimum amount of anhydrous acetonitrile was added into a 100 mL solution of 10 mM rubrene in anhydrous dichloromethane with stirring. To this mixture was added a solution of 0.5 mmol of iodine in a minimum amount of anhydrous dichloromethane. The color of solution immediately changed from orange to saffron, and straw yellow precipitate formed. After stirring for 30 min, the mixture was separated by centrifuging at 12 000 rpm. Rubrene perchlorate was separated in solution phase, and treated by decompressed distillation to remove solvent. The salt with olive-drab color was obtained and dried airproofed at room temperature.
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16.Crystal structure of triclinic rubrene crystal was viewed with the software MERCURY 1.4: , , , , , and . The CCDC (Cambridge Crystallographic Data Centre) number is 726176.
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We report a solution-processed chemical reaction approach to patternedgrowth of rubrene polycrystalline films over Ag electrodes for organic field effect transistors. The reduction in cationic precursors of by Ag atoms generated neutral molecules with a concentration above the nucleation threshold near to the electrodesurfaces. This initiates the site-specific nucleation followed by growth of rubrene nanocrystals on the electrodes. These rubrene nanocrystals were found in the triclinic crystal phase and formed a polycrystalline film across the source and drain electrodes. The mobilities of rubrene transistors can achieve with an on/off ratio of .
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