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US 10,475,941 B2Granted
Photodetector with conductive channel made from two dimensional material
AssigneeNokia Technologies Oy
InventorsAlexander Bessonov, Adam Robinson, Darryl Cotton, Richard White
Life of this patent
Estimating the term…
Abstract
A photodetector has a two dimensional conductive channel and a quantum dot layer configured to generate charge on exposure to incident electromagnetic radiation. The surface texture of the quantum dot layer has texturing to provide surface roughness which increases the amount of electromagnetic radiation absorbed in the quantum dot layer in comparison to a photodetector having a flat (non-textured) incident electromagnetic radiation surface.
Claims19
An apparatus comprising:
- a conductive channel with source and drain electrodes configured to enable a flow of electrical current through the conductive channel;
- and
- a quantum dot layer overlying the conductive channel, the quantum dot layer configured to generate charge on exposure to incident electromagnetic radiation, the generated charge producing an electric field which causes a change in electrical current passing through the underlying conductive channel, the change in electrical current indicative of one or more of the presence and magnitude of the incident electromagnetic radiation;
- wherein the quantum dot layer is configured to have an incident electromagnetic radiation surface, opposite a surface in contact with the conductive channel, which has a texturing comprising undulations in the surface to provide a surface roughness with an average peak amplitude of the order of between 10 nm and 300 nm.
1 more element
A method comprising:
- providing a conductive channel;
- providing source and drain electrodes configured to enable a flow of electrical current through the conductive channel;
- and
- providing a quantum dot layer overlying the conductive channel, the quantum dot layer configured to generate charge on exposure to incident electromagnetic radiation, the generated charge producing an electric field which causes a change in electrical current passing through the underlying conductive channel, the change in electrical current indicative of one or more of the presence and magnitude of the incident electromagnetic radiation;
- wherein the quantum dot layer is configured to have an incident electromagnetic radiation surface opposite a surface in contact with the conductive channel, which has a texturing comprising undulations in the surface to provide a surface roughness with an average peak amplitude of the order of between 10 nm and 300 nm.
2 more elements
Dependencies are inferred from the claim text.