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Organic thin-film transistors (OTFTs) have been locally grown using solution-phase crystallization of pentacene at room temperature. For crystals grown on the surface, carrier mobility was measured to be approximately 3.0 cm2/V middot s with on/off ratios above 106. V-shape trenches in the substrate helped to localize the crystallization to within the trenches, and these devices showed similar performance to the surface-grown crystals. This letter suggests that quality OTFT devices may be manufactured using low-cost scalable techniques at room temperature.