Patent ID: 11908901
Assignee: REGENTS OF THE UNIVERSITY OF MINNESOTA
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. 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.