Energy efficient ferroelectric device and method for making the same
AssigneesUniversity of Maryland, College Park, Regents of the University of Minnesota
InventorsCheng Gong, Tony Low, Jian-Ping Wang
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Abstract
Disclosed are energy efficient ferroelectric devices and methods for making such devices. For example, a ferroelectric device may be a ferroelectric tunneling junction device that includes a graphene layer on a substrate. A tunneling layer may be disposed on a portion of the graphene layer. The tunneling layer may be a ferroelectric material. A metal electrical contact layer may be disposed over the tunneling layer and the graphene layer. Additionally, some embodiments may have an additional monolayer disposed between the tunneling layer and graphene layer. By specific engineering of such layers, tunneling electroresistance performance may be substantially improved.
Claims21
A ferroelectric device comprising:
- a substrate;
- a first two-dimensional (2D) ferroelectric layer disposed on the substrate, the first 2D ferroelectric layer comprising a first 2D ferroelectric material and being 2 to 4 monolayers in thickness;
- a second 2D ferroelectric layer selectively disposed over a portion of the first 2D ferroelectric layer, the second 2D ferroelectric layer comprising a second 2D ferroelectric material and being at least two monolayers in thickness;
- and
- a first metallic electrical contact layer disposed on the first 2D ferroelectric layer and a second metallic electrical contact layer disposed on the second 2D ferroelectric layer such that the second 2D ferroelectric layer is between the second metallic electrical contact layer and the first 2D ferroelectric layer.
A device comprising:
- a substrate;
- a first two-dimensional (2D) ferroelectric layer disposed on the substrate, the first 2D ferroelectric layer comprising a first 2D ferroelectric material;
- a second 2D ferroelectric layer selectively disposed over a portion of the first 2D ferroelectric layer, the second 2D ferroelectric layer comprising a second 2D ferroelectric material;
- a third 2D layer disposed between the first 2D ferroelectric layer and the second 2D ferroelectric layer, the third 2D layer comprising a monolayer;
- and
- a first electrical contact layer disposed on the first 2D ferroelectric layer and a second electrical contact layer disposed on the second 2D layer such that the second 2D ferroelectric layer is between the second electrical contact layer and the first 2D ferroelectric layer.
Dependencies are inferred from the claim text.