Patent ID: 11901431
Assignee: RICOH COMPANY, LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C  G | IPC G  H

Claim 0:
1. A field-effect transistor comprising:
a source electrode and a drain electrode;
a gate electrode;
a semiconductor layer; and
a gate insulating layer,
wherein the gate insulating layer is an oxide insulator film including A element and B element, the A element being one or more selected from the group consisting of Zr and Hf and the B element being one or more selected from the group consisting of Be and Mg, and
wherein the oxide insulator film is an oxide insulator film of a (Be, Mg)O—(Zr, Hf)O2-system, where the oxide insulator film is free from a perovskite phase and a layered perovskite phase.