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We report a high-performance transparent amorphous indium gallium zinc oxide thin-film transistor (a-IGZO TFT) gated by atomic layer deposition (ALD)-deposited HfAlO _x . Through a postfabrication annealing optimization process, the total trap density of the device can be reduced in two orders of magnitudes. The subthreshold swing (SS) reaches an ultralow level of 62.29 mV/dec due to the low defect states. A large and a high mobility of 2.76 and 18.94 cm ² / can be achieved, respectively. In addition, the devices exhibit good stability in terms of positive bias stress, thermal, and aging tests. The defect optimization process has been verified by the X-ray photoelectron spectroscopy analysis. Finally, a resistor-loaded inverter was constructed, which showed ideal swing characteristics and its voltage gain was as high as 39 at 7 V. These results indicate such a-IGZO TFT is of great potential for …