Patterned Growth of Large Oriented Organic Semiconductor Single Crystals on Self-Assembled Monolayer Templates

There has been a recent surge of interest in the fabrication of electronic devices from high quality single crystals of organic semiconductors.1,2 The importance of using the single crystals stems from the fact that intrinsic charge transport properties can be probed due to the lack of grain boundaries and molecular disorder1sthe defects commonly present in polycrystalline organic thin films.3 Such defects cause low mobilities and, therefore, reduce the per-formance of organic thin film transistors (OTFTs). In contrast, mobilities as high as 20 cm2/Vs have been reported for single-crystal rubrene transistors.2c Despite the high mobilities reported for single-crystal devices, there are many factors limiting their applications. In addition to the difficulties of fabricating good electrical contacts on single crystals, the most challenging task is handling the fragile crystals. Currently, single crystals are hand-picked and made into an individual device, but this method is im