摘要:
A silicon carbide MOSFET (10) is formed to have a high breakdown voltage. A breakdown enhancement layer (20) is formed between a channel region (14) and a drift layer (12). The breakdown enhancement layer (20) has a lower doping concentration that increases the width of a depletion region (24) near a gate insulator (17). The increased depletion region width improves the breakdown voltage.
摘要:
A diode protected semiconductor device appropriate for the output of a radio frequency amplifier, which can withstand substantial power reflection due to output impedance mismatch, is provided. The device may be implemented monolithically, in the form of a field effect transistor (FET) (14) having a back to back diode pair (17) connecting the drain (18) to the source (19). The FET comprises multiple transistor portions (28) coupled together. The diode pair comprises corresponding diode pair portions (37) coupled together. The configuration provides easy integration of the diode pair (17) into typical FET structures.
摘要:
A silicon carbide vertical MOSFET formed on a silicon carbide substrate with portions of epitaxial layers defining the various transistor electrodes, rather than defining the electrodes with implants and diffusion. An opening is formed in some of the epitaxial layers and a conductive layer is formed therein to electrically connect a drain contact on the rear of the substrate to the components on the front of the substrate.
摘要:
A dual-gate gallium arsenide power MESFET chip comprising a source region surrounded by a first gate, a second surrounding the first gate, a drain region juxtaposed to said second gate, and a shorting bar which couples the second gate to the source region. This combination, used in a multi-fingered application, provides a reverse breakdown voltage substantially higher than prior art devices.
摘要:
A lateral gate, vertical drift region transistor including a drain positioned on one surface of a substrate and a doped structure having a buried region therein positioned on the other surface of the substrate. The buried region defining a drift region in the doped structure extending vertically from the substrate and further defining a doped region in communication with the drift region and adjacent the surface of the doped structure. A source positioned on the doped structure in communication with the doped region and an implant region positioned in the doped region adjacent the surface and in communication with the source and buried region. An insulating layer positioned on the doped structure with a metal gate positioned on the insulating layer so as to define an inversion region in the implant region extending laterally adjacent the control terminal and communicating with the drift region and the source.
摘要:
A lateral gate, vertical drift region transistor including a drain positioned on one surface of a substrate and a doped structure having a buried region therein positioned on the other surface of the substrate. The buried region defining a drift region in the doped structure extending vertically from the substrate and further defining a doped region in communication with the drift region and adjacent the surface of the doped structure. A source positioned on the doped structure in communication with the doped region and an implant region positioned in the doped region adjacent the surface and in communication with the source and buried region. An insulating layer positioned on the doped structure with a metal gate positioned on the insulating layer so as to define an inversion region in the implant region extending laterally adjacent the control terminal and communicating with the drift region and the source.
摘要:
A silicon carbide MESFET (10) is formed to have a source (21) and a drain (22) that are self-aligned to a gate (16) of the MESFET (10). The gate (16) is formed to have a T-shaped structure with a gate-to-source spacer (18) and gate-to-drain spacer (19) along each side of a base of the gate (16). The gate (16) is used as a mask for implanting dopants to form the source (21) and drain (22). A laser annealing is performed after the implantation to activate the dopants. Because the laser annealing is a low temperature operation, the gate (16) is not detrimentally affected during the annealing.
摘要:
A silicon carbide LOCOS vertical MOSFET formed on a silicon carbide substrate with portions of epitaxial layers defining the various transistor regions, rather than defining the regions with implants and diffusion. Because of the low diffusion rate in silicon carbide, the LOCOS operation can be performed after the doped epitaxial layers are formed.
摘要:
A silicon carbide vertical MOSFET formed on a silicon carbide substrate with portions of epitaxial layers defining the various transistor electrodes, rather than defining the electrodes with implants and diffusion. An opening is formed in some of the epitaxial layers and a conductive layer is formed therein to electrically connect a drain contact on the rear of the substrate to the components on the front of the substrate.
摘要:
A silicon carbide LOCOS vertical MOSFET formed on a silicon carbide substrate with portions of epitaxial layers defining the various transistor electrodes, rather than defining the electrodes with implants and diffusion. Because of the low diffusion rate in silicon carbide, the LOCOS operation can be performed after the doped epitaxial layers are formed.