Abstract:
Disclosed is a semiconductor device comprising a group 13 nitride heterojunction comprising a first layer having a first bandgap and a second layer having a second bandgap, wherein the first layer is located between a substrate and the second layer; and a Schottky electrode and a first further electrode each conductively coupled to a different area of the heterojunction, said Schottky electrode comprising a central region and an edge region, wherein the element comprises a conductive barrier portion located underneath said edge region only of the Schottky electrode for locally increasing the Schottky barrier of the Schottky electrode. A method of manufacturing such a semiconductor device is also disclosed.
Abstract:
A GaN hetereojunction structure has a three-layer dielectric structure. The lowermost and middle portions of the gate electrode together define the gate foot, and this is associated with two dielectric layers. A thinner first dielectric layer is adjacent the gate edge at the bottom of the gate electrode. The second dielectric layer corresponds to the layer in the conventional structure, and it is level with the main portion of the gate foot.
Abstract:
Consistent with an example embodiment, a GaN heterojunction structure has a three-layer dielectric structure. The lowermost and middle portions of the gate electrode together define the gate foot, and this is associated with two dielectric layers. A thinner first dielectric layer is adjacent the gate edge at the bottom of the gate electrode. The second dielectriclayer corresponds to the layer in the conventional structure, and it is level with the main portion of the gate foot.
Abstract:
A method of manufacturing a semiconductor device includes forming trench isolation structures, exposing some of the trench isolation structures 28 to leave others 30 masked, and then selectively etching a buried layer to form a cavity 32 under an active device region 34. The active device region 34 is supported by support regions in the exposed trenches 28. The buried layer may be a SiGe layer on a Si substrate.
Abstract:
A semiconductor device and a method of making the same are disclosed. The device includes a substrate including an AlGaN layer located on a GaN layer for forming a two dimensional electron gas at an interface between the AlGaN layer and the GaN layer. The device also includes a plurality of electrical contacts located on a major surface of the substrate. The device further includes a plurality of passivation layers located on the major surface of the substrate. The plurality of passivation layers includes a first passivation layer of a first passivation material contacting a first area of the major surface and a second passivation layer of a second passivation material contacting a second area of the major surface. The first and second passivation materials are different passivation materials. The different passivation materials may be compositions of silicon nitride that include different proportions of silicon
Abstract:
A semiconductor device comprising: a die-source-terminal, a die-drain-terminal and a die-gate-terminal; a semiconductor-die; an insulated-gate-depletion-mode-transistor provided on the semiconductor-die, the insulated-gate-depletion-mode-transistor comprising a depletion-source-terminal, a depletion-drain-terminal and a depletion-gate-terminal, wherein the depletion-drain-terminal is coupled to the die-drain-terminal and the depletion-gate-terminal is coupled to the die-source-terminal; an enhancement-mode-transistor comprising an enhancement-source-terminal, an enhancement-drain-terminal and an enhancement-gate-terminal, wherein the enhancement-source-terminal is coupled to the die-source-terminal, the enhancement-gate-terminal is coupled to the die-gate-terminal and the enhancement-drain-terminal is coupled to the depletion-source-terminal; and a clamp-circuit coupled between the depletion-source-terminal and the depletion-gate-terminal.
Abstract:
A cascoded power semiconductor circuit has a clamp circuit between the source and gate of a gallium nitride or silicon carbide FET to provide avalanche protection for the cascode MOSFET transistor.
Abstract:
In an example embodiment, a heterojunction device comprises a substrate, a multilayer structure disposed on the substrate. The multilayer structure has a first layer having a first semiconductor disposed on top of the substrate; a second layer has a second semiconductor is disposed on top of the first layer defining an interface between them. The second semiconductor differs from the first semiconductor such that a 2D Electron Gas forms adjacent to the interface. A first terminal couples to a first area of the interface between the first and second layers and a second terminal couples to a second area of the interface between the first and second layers; an electrically conducting channel comprises a metal or a region of the first layer with a higher defect density than another region of the first layer. The channel connects the second terminal and a region of the first layer such that electric charge can flow between them.
Abstract:
An isolated semiconductor circuit comprising: a first sub-circuit and a second sub-circuit; a backend that includes an electrically isolating connector between the first and second sub-circuits; a lateral isolating trench between the semiconductor portions of the first and second sub-circuits, wherein the lateral isolating trench extends along the width of the semiconductor portions of the first and second sub-circuits, wherein one end of the isolating trench is adjacent the backend, and wherein the isolating trench is filled with an electrically isolating material.
Abstract:
Embodiments relate to a diode circuit which uses a Schottky diode. A parallel bypass branch has a switch and bypass diode in series. The operation of the switch is dependent on the voltage across the Schottky diode so that the bypass function is only effective when a desired voltage is reached. The diode circuit can be used as a replacement for a single diode, and provides bypass current protection preferably without requiring any external control input.