A pentacene-based organic thin-film transistor (OTFT) with a porous active layer is demonstrated for the first time. The porous OTFT exhibits a fast, sensitive, and reversible response to ammonia gas with a detection limit as 500 ppb, whereas the OTFT without porous structure has a slow response and a poor recovery behavior. The sensing mechanism dominated by the dissociation of hydroxyl groups of the polymer dielectric layer is raised and discussed. The proposed device is the first OTFT-based ammonia sensor with reversible response and high sensitivity in low parts-per-million range. It is promising for the development of a diagnostic breath analysis system.

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This paper reports the effect of off-state stress on the LTPS TFTs on plastic substrates. In this study, by giving LTPS devices off-state bias stress one millisecond, it could get an excellent off-state current from 50 pA to 2pA when device operate at VGS=+7V, VDS=-5.1V. This could be attributed to electron trapping occur in gate insulator could reduce off-state electric field near to drain region.

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