Solution-based patterned growth of rubrene nanocrystals for organic field effect transistors

Liang Luo; Ge Liu; Liwei Huang; Xinqiang Cao; Ming Liu; Hongbing Fu; Jiannian Yao
December 2009
Applied Physics Letters;12/28/2009, Vol. 95 Issue 26, p263312
Academic Journal
We report a solution-processed chemical reaction approach to patterned growth of rubrene polycrystalline films over Ag electrodes for organic field effect transistors. The reduction in cationic precursors of Ru•+ by Ag atoms generated neutral molecules with a concentration above the nucleation threshold near to the electrode surfaces. 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 0.02 cm2 V-1 s-1 with an on/off ratio of 103.


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