Patent ID: 11876128
Assignee: nan
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A field effect transistor comprising:
a first semiconductor structure, the first semiconductor structure having a channel layer;
a second semiconductor structure, the second semiconductor structure is arranged on the first semiconductor structure, and the second semiconductor structure is stacked in sequence from bottom to top with a Schottky layer, at least a first etch stop layer, a wide recess layer, an ohmic contact layer, and a narrow recess is opened in the wide recess layer, a wide recess is opened in the ohmic contact layer and the wide recess is located above the narrow recess, so that an upper surface of the wide recess layer forms a wide recess area and an upper surface of the Schottky layer forms a narrow recess area, said wide recess layer is formed by a first wide recess layer and a second wide recess layer, said first wide recess layer is positioned above said second wide recess layer;
at least one delta-doped layer, the at least one delta-doped layer is sandwiched between said first wide recess layer and said second wide recess layer, a lower surface of said at least one delta-doped layer is displaced 1-10 nm from a bottom surface of the second wide recess layer of the wide recess layer, and wherein at least one of said first and second wide recess layers has a gradient doping profile that includes one of linear gradient, step gradient, quadratic gradient, exponential or a combination thereof;
a gate metal contact, the gate metal contact is formed inside the wide recess and at a bottom surface of the narrow recess, within the narrow recess area;
a source metal contact, the source metal contact is arranged on the ohmic contact layer, and the source metal contact is located on a first side of the gate metal contact; and
a drain metal contact, the drain metal contact is arranged on the ohmic contact layer, and the drain metal contact is located on a second side of the gate metal contact.