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US 11,908,901 B1Granted
Graphene varactor including ferroelectric material
AssigneeRegents of the University of Minnesota
InventorsSteven J. Koester, Venkata Raghava Saran Kumar Chaganti
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Abstract
A varactor may include a gate electrode; a graphene layer; and a ferroelectric layer between the gate electrode and the graphene layer.
Claims20
A varactor comprising:
- a gate electrode;
- a graphene layer;
- and
- a ferroelectric layer between the gate electrode and the graphene layer,
- wherein a capacitance tuning range of the varactor is based at least partially on a quantum capacitance effect of the graphene layer, and
- wherein a capacitance state of the varactor is non-volatile and based at least partially on the quantum capacitance effect.
3 more elements
A varactor comprising:
- an insulator layer defining a plurality of fingers, wherein a first finger of the plurality of fingers extends in a first direction within the insulator layer, and wherein a second finger of the plurality of fingers extends in a second direction substantially opposite to the first direction;
- a gate electrode in the plurality of fingers;
- a first graphene layer positioned over the first finger;
- a second graphene layer positioned over the second finger;
- a ferroelectric layer between the gate electrode and the first graphene layer and between the gate electrode and the second graphene layer;
- and
- at least one contact electrode formed on the first and second graphene layers and making electrical contact with the first and second graphene layers,
- wherein a capacitance tuning range of the varactor is based at least partially on a quantum capacitance effect of the graphene layer, and
- wherein a capacitance state of the varactor is non-volatile and based at least partially on the quantum capacitance effect.
6 more elements
A varactor comprising:
- a gate electrode;
- a graphene layer consisting essentially of graphene;
- and
- a ferroelectric layer between the gate electrode and the graphene layer,
- wherein a capacitance tuning range of the varactor is based at least partially on a quantum capacitance effect of the graphene layer, and
- wherein a capacitance state of the varactor is non-volatile and based at least partially on the quantum capacitance effect.
3 more elements
Dependencies are inferred from the claim text.