Patent ID: 11950429
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A ferroelectric capacitor for a memory device, the ferroelectric capacitor comprising:
a first electrode;
a second electrode facing the first electrode;
a ferroelectric layer between the first electrode and the second electrode, the ferroelectric layer including a hafnium-based oxide;
a first interfacial layer directly between the ferroelectric layer and the first electrode such that the first interfacial layer directly contacts both the first electrode and the ferroelectric layer; and
a second interfacial layer directly between the ferroelectric layer and the second electrode such that the second interfacial layer directly contacts both the second electrode and the ferroelectric layer,
wherein each of the first interfacial layer and the second interfacial layer is HfO2,
wherein each of the first interfacial layer and the second interfacial layer has a thickness in a range of more than 40 Å up to 200 Å, and
wherein the ferroelectric capacitor further includes oxygen vacancies at
interfaces of the first interfacial layer and at least one of the first electrode or the ferroelectric layer which directly contact the first interfacial layer, and
interfaces of the second interfacial layer and at least one of the second electrode or the ferroelectric layer which directly contact the second interfacial layer,

wherein the first interfacial layer, the second interfacial layer, and the ferroelectric layer are separate layers, and the ferroelectric layer includes a different material composition than the first and second interfacial layers.