Several new phenomena are observed comparing the ac stress with the dc stress. In the initial stress period (< 30 s), the deuterium isotope effect is smaller for ac stress than for dc stress, which is ascribed to the hole injection. In the final stress stage (> 104 s), the saturation of the Gm degradation stops and the Gm degradation starts to increase again for ac stress, which is probably due to the hole trapping.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering