FIELD-EFFECT TRANSISTOR, DISPLAY ELEMENT, IMAGE DISPLAY DEVICE, AND SYSTEM

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A field-effect transistor including : a substrate; a passivation layer; a gate insulating layer formed between the substrate and the passivation layer; a source electrode and a drain electrode, which are formed to be in contact with the gate insulating layer; a semiconductor layer, which is formed at least between the source electrode and the drain electrode and is in contact with the gate insulating layer, the source electrode, and the drain electrode; and a gate electrode, which is in contact with the gate insulating layer and faces the semiconductor layer via the gate insulating layer, wherein the passivation layer contains a first complex oxide containing an alkaline earth metal and a rare-earth element, and wherein the gate insulating layer contains a second complex oxide containing an alkaline earth metal and a rare-earth element.