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We have succeeded in forming a Ga-Sn-O (GTO) film for a thin-film transistor (TFT) using radio-frequency (RF) magnetron sputtering at room temperature without annealing process. The field-effect mobility is 0.48 cm2·V−1·s−1 and the threshold voltage is 2.22 V. This result suggests a possibility of rare-metal free amorphous metal-oxide semiconductors.
We have evaluated characteristics of Ga-Sn-O (GTO) thin films deposited by RF magnetron sputtering with changing composition ratios of sputtering targets and deposition pressure. The optical transmittance is more than 80%, and the sheet resistance decreases as the deposition pressure increase for the thin films for Ga∶Sn=1∶3, On the other hand, for the thin films for Ga∶Sn=3∶1, both the transmittance...
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