摘要:
A method for growing high mobility, high charge Nitrogen polar (N-polar) or Nitrogen face (In, Al, Ga)N/GaN High Electron Mobility Transistors (HEMTs). The method can provide a successful approach to increase the breakdown voltage and reduce the gate leakage of the N-polar HEMTs, which has great potential to improve the N-polar or N-face HEMTs' high frequency and high power performance.
摘要:
A method for fabricating an electronic device, comprising wafer bonding a first semiconductor material to a III-nitride semiconductor, at a temperature below 550° C., to form a device quality heterojunction between the first semiconductor material and the III-nitride semiconductor, wherein the first semiconductor material is different from the III-nitride semiconductor and is selected for superior properties, or preferred integration or fabrication characteristics in the injector region as compared to the III-nitride semiconductor.
摘要:
A current aperture vertical electron transistor (CAVET) with ammonia (NH3) based molecular beam epitaxy (MBE) grown p-type Gallium Nitride (p-GaN) as a current blocking layer (CBL). Specifically, the CAVET features an active buried Magnesium (Mg) doped GaN layer for current blocking purposes. This structure is very advantageous for high power switching applications and for any device that requires a buried active p-GaN layer for its functionality.
摘要:
Methods for the heteroepitaxial growth of smooth, high quality films of N-face GaN film grown by MOCVD are disclosed. Use of a misoriented substrate and possibly nitridizing the substrate allow for the growth of smooth N-face GaN and other Group III nitride films as disclosed herein. The present invention also avoids the typical large (μm sized) hexagonal features which make N-face GaN material unacceptable for device applications. The present invention allows for the growth of smooth, high quality films which makes the development of N-face devices possible.
摘要:
A low resistance tunnel junction that uses a natural polarization dipole associated with dissimilar materials to align a conduction band to a valence band is disclosed. Aligning the conduction band to the valence band of the junction encourages tunneling across the junction. The tunneling is encouraged, because the dipole space charge bends the energy bands, and shortens a tunnel junction width charge carriers must traverse to tunnel across the junction. Placing impurities within or near the tunnel junction that may form deep states in the junction may also encourage tunneling in a tunnel junction. These states shorten the distance charge carriers must traverse across the tunnel junction.
摘要:
A method for fabricating III-N semiconductor devices on the N-face of layers comprising (a) growing a III-nitride semiconductor device structure in a Ga-polar direction on a substrate, (b) attaching a Ga face of the III-nitride semiconductor device structure to a host substrate, and (c) removing the substrate to expose the N-face surface of the III-nitride semiconductor device structure. An N-polar (000-1) oriented III-nitride semiconductor device is also disclosed, comprising one or more (000-1) oriented nitride layers, each having an N-face opposite a group III-face, wherein at least one N-face is an at least partially exposed N-face, and a host substrate attached to one of the group III-faces.
摘要:
A flip-chip integrated circuit includes a circuit substrate having electronic components. The circuit substrate typically includes GaAs or Si. Another substrate can include Group III nitride based active semiconductor devices. This substrate typically includes SiC and can be separated to provide individual nitride devices. After separation, one or more of the Group III devices can be flip-chip mounted onto the circuit substrate. The electronic components on the circuit substrate can be coupled to the nitride devices using conductive interconnects and/or vias.
摘要:
The gate voltage breakdown of an integrated circuit field effect transistor, especially a compound semiconductor metal semiconductor field effect transistor (MESFET) and high electron mobility transistor (HEMT) is dramatically increased by forming an electron trap layer on the surface of the device, under the gate contact and extending beyond the gate contact towards the drain contact. The electron trap layer is preferably a high resisitivity lattice matched monocrystalline layer having at least 10.sup.18 traps per cubic centimeter. For gallium arsenide based transistors, the electron trap layer is preferably formed by low temperature molecular beam epitaxy (MBE) of gallium and arsenic fluxes, to produce a monocrystalline gallium arsenide layer having 1% excess arsenic. For indium phosphide based transistors, the electron trap layer is preferably formed by low temperature MBE of aluminum, indium and arsenic fluxes to produce a monocrystalline aluminum indium arsenide layer having 1% excess arsenic.
摘要:
A planar doped barrier region of semiconductor material is coupled to a vacuum or gaseous region to provide electron emission from the planar doped barrier region into the vacuum or gaseous region. When a voltage is applied across the planar doped barrier region electrons flow from one end of the region to another. This flow results in the emission of electrons if the work function of the emission surface is less than the bandgap of the semiconductor material. The device of the present invention can be used as a vacuum microelectronic emitter, a vacuum microelectronic transistor, light source, klystron, or travelling wave tube.
摘要:
A method for fabricating a potential barrier for a nitrogen-face (N-face) nitride-based electronic device, comprising using a thickness and polarization induced electric field of a III-nitride interlayer, positioned between a first III-nitride layer and a second III-nitride layer, to shift, e.g., raise or lower, the first III-nitride layer's energy band with respect to the second III-nitride layer's energy band by a pre-determined amount. The first III-nitride layer and second III-nitride layer each have a higher or lower polarization coefficient than the III-nitride interlayer's polarization coefficient.