Permissions for ReuseFlexible all-polymer transistor has received much attention because it is needed for the unique area of flexible circuits and displays, and the solution processing allowed with polymers would enable low-cost production. In this work, we introduce and utilize ultraviolet (UV) printing technique for the fabrication of flexible all-polymer transistor. The technique allows printing of submicron patterns of polymers without applying heat or pressure, requiring only UV light. The UV printing also allows self-aligned gate formation, which can be accomplished through a simple roll-to-roll printing. The electrical performance of the flexible transistor thus fabricated is better than that of the other flexible all-polymer transistors. ©2008 American Institute of Physics