Effect of RF Sputtering Power on the Electrical Properties of Si–In–Zn–O Thin Film Transistors
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The electrical characteristics of the amorphous silicon–indium–zinc–oxide (a-SIZO) thin film transistors (TFTs) has been investigated depending on the RF magnetron sputtering power. As increasing the radio frequency sputtering power from 20 to 40 W, the electrical characteristics showed the change of threshold voltage (Vth) to negative direction from 2 to −2.61 V due to the increase of oxygen vacancy (VO). Based on the shift of Vth controlled by sputtering power, inverter was fabricated with the TFTs fabricated at sputtering power of 20 W and 30 W as enhancement mode and 40 W as depletion mode. The voltage transfer curve showed inversion clearly, and the voltage gain showed 1 V/V and 1.65 V/V, respectively. These results reveal that it is possible to apply to integrated circuits or the next generation memory devices simply by controlling processing conditions.