We fabricated and characterized the advanced amorphous silicon thin-film transistors with a bilayer structure for both the active and gate dielectric films. The electrical field across the gate insulator has a significant influence on the device threshold voltage electrical stability. We show that high thin-film transistor stability can be achieved even under the presence of a high channel current. Its electrical and high-temperature stability improves up to a factor of five when the TFT biasing condition changes from the linear to the saturation region of operation.
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Kuo et al. (2008) studied this question.
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