The influence of sputtering power and $O2/Ar$ flow ratio on the performance and stability of Hf–In–Zn–O thin film transistors under illumination

The performance and stability of amorphous HfInZnO thin film transistors under visible light illumination were studied. The extent of device degradation upon negative bias stress with the presence of visible light is found to be strongly sensitive to the extent of photoelectric effect in the oxide semiconductor. Highly stable devices were fabricated by optimizing the deposition conditions of HfInZnO films, where the combination of high sputtering power and high $O2/Ar$ gas flow ratio was found to result in the highest stability under bias stress experiments.