Abstract: Semiconductor devices include a plurality of gate fingers extending on a wide bandgap semiconductor layer structure. An inter-metal dielectric pattern is formed on the gate fingers, the inter-metal dielectric pattern including a plurality of dielectric fingers that cover the respective gate fingers. A top-side metallization is provided on the inter-metal dielectric pattern and on exposed portions of the upper surface of the wide bandgap semiconductor layer structure. The top-side metallization includes a first conductive diffusion barrier layer on the inter-metal dielectric pattern and on the exposed portions of the upper surface of the wide bandgap semiconductor layer structure, a conductive contact layer on an upper surface of the first conductive diffusion barrier layer, and a grain stop layer buried within the conductive contact layer.

Abstract: Semiconductor devices include a plurality of gate fingers extending on a wide bandgap semiconductor layer structure. An inter-metal dielectric pattern is formed on the gate fingers, the inter-metal dielectric pattern including a plurality of dielectric fingers that cover the respective gate fingers. A top-side metallization is provided on the inter-metal dielectric pattern and on exposed portions of the upper surface of the wide bandgap semiconductor layer structure. The top-side metallization includes a first conductive diffusion barrier layer on the inter-metal dielectric pattern and on the exposed portions of the upper surface of the wide bandgap semiconductor layer structure, a conductive contact layer on an upper surface of the first conductive diffusion barrier layer, and a grain stop layer buried within the conductive contact layer.

Abstract: A Schottky diode includes a drift region, a channel in an upper portion of the drift region, and first and second adjacent blocking junctions in the upper portion of the drift region that define the channel therebetween. The drift region and channel are doped with dopants having a first conductivity type, and the first and second blocking junctions doped with dopants having a second conductivity type that is opposite the first conductivity type. The blocking junctions extend at least one micron into the upper portion of the drift region and are spaced apart from each other by less than 3.0 microns.

Abstract: A Schottky diode includes a drift region, a channel in an upper portion of the drift region, and first and second adjacent blocking junctions in the upper portion of the drift region that define the channel therebetween. The drift region and channel are doped with dopants having a first conductivity type, and the first and second blocking junctions doped with dopants having a second conductivity type that is opposite the first conductivity type. The blocking junctions extend at least one micron into the upper portion of the drift region and are spaced apart from each other by less than 3.0 microns.

Abstract: An electronic device includes a silicon carbide layer including an n-type drift region therein, a contact forming a Schottky junction with the drift region, and a p-type junction barrier region on the silicon carbide layer. The p-type junction barrier region includes a p-type polysilicon region forming a P-N heterojunction with the drift region, and the p-type junction barrier region is electrically connected to the contact.

Abstract: An electronic device includes a silicon carbide layer including an n-type drift region therein, a contact forming a Schottky junction with the drift region, and a p-type junction barrier region on the silicon carbide layer. The p-type junction barrier region includes a p-type polysilicon region forming a P-N heterojunction with the drift region, and the p-type junction barrier region is electrically connected to the contact.

Abstract: A high power, high frequency semiconductor device has a plurality of unit cells connected in parallel. The unit cells each having a controlling electrode and first and second controlled electrodes. A thermal spacer divides at least one of the unit cells into a first active portion and a second active portion, spaced apart from the first potion by the thermal spacer. The controlling electrode and the first and second controlled electrodes of the unit cell cross over the first thermal spacer.

Abstract: A high electron mobility transistor (HEMT) is disclosed that includes a semi-insulating silicon carbide substrate, an aluminum nitride buffer layer on the substrate, an insulating gallium nitride layer on the buffer layer, an active structure of aluminum gallium nitride on the gallium nitride layer, a passivation layer on the aluminum gallium nitride active structure, and respective source, drain and gate contacts to the aluminum gallium nitride active structure.

Abstract: A high electron mobility transistor (HEMT) is disclosed that includes a semi-insulating silicon carbide substrate, an aluminum nitride buffer layer on the substrate, an insulating gallium nitride layer on the buffer layer, an active structure of aluminum gallium nitride on the gallium nitride layer, a passivation layer on the aluminum gallium nitride active structure, and respective source, drain and gate contacts to the aluminum gallium nitride active structure.

Abstract: A high electron mobility transistor (HEMT) (10) is disclosed that includes a semi-insulating silicon carbide substrate (11), an aluminum nitride buffer layer (12) on the substrate, an insulating gallium nitride layer (13) on the buffer layer, an active structure of aluminum gallium nitride (14) on the gallium nitride layer, a passivation layer (23) on the aluminum gallium nitride active structure, and respective source, drain and gate contacts (21, 22, 23) to the aluminum gallium nitride active structure.

Abstract: A high electron mobility transistor (HEMT) is disclosed that includes a semi-insulating silicon carbide substrate, an aluminum nitride buffer layer on the substrate, an insulating gallium nitride layer on the buffer layer, an active structure of aluminum gallium nitride on the gallium nitride layer, a passivation layer on the aluminum gallium nitride active structure, and respective source, drain and gate contacts to the aluminum gallium nitride active structure.

Abstract: A high electron mobility transistor (HEMT) is disclosed that includes a semi-insulating silicon carbide substrate, an aluminum nitride buffer layer on the substrate, an insulating gallium nitride layer on the buffer layer, an active structure of aluminum gallium nitride on the gallium nitride layer, a passivation layer on the aluminum gallium nitride active structure, and respective source, drain and gate contacts to the aluminum gallium nitride active structure.