NON-LINEAR ELEMENT, DISPLAY DEVICE INCLUDING NON-LINEAR ELEMENT, AND ELECTRONIC DEVICE INCLUDING DISPLAY DEVICE

摘要

A non-linear element, such as a diode, in which an oxide semiconductor is used and a rectification property is favorable is provided. In a thin film transistor including an oxide semiconductor in which the hydrogen concentration is less than or equal to 5 x 1019 /cm3, the work function ?ms of a source electrode in contact with the oxide semiconductor, the work function ?md of a drain electrode in contact with the oxide semiconductor, and electron affinity ? of the oxide semiconductor satisfy ?ms = ? ?md. By electrically connecting a gate electrode and the drain electrode of the thin film transistor, a non-linear element with a more favorable rectification property can be achieved.