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Improvement of On–Off-Current Ratio in $ hbox{TiO}_{rm x}$ Active-Channel TFTs Using $hbox{N}_{2} hbox{O}$ Plasma Treatment
Abstract: Without sacrificing the on-current in the transfer characteristics, we have successfully reduced the off-current part by the optimal $hbox{N}_{2}hbox{O}$ plasma treatment to improve the on–off-current ratio in n-type titanium oxide $( hbox{TiO}_{rm x})$ active-channel thin-film transistors. While the high-power (275 W) $hbox{N}_{2}hbox{O}$ plasma treatment oxidizes the whole $hbox{TiO}_{rm x}$ channel and results in the reduction of both on- and off-current, the optimized low-power (150 W) process makes the selective oxidation of the top portion in the channel and reduces only the off-current significantly. Increase in on–off ratio by almost five orders of magnitude is achieved without change in on-current by using the presented method.
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