摘要:
A semiconductor device having a Shottky junction comprises: a first semiconductor area composed of an n-type semiconductor; a second semiconductor area composed of an n-type semiconductor of a higher resistance than in said first semiconductor area; an insulation film provided adjacent to said second semiconductor area and having an aperture therein; an electrode area provided in said aperture; and a third semiconductor area composed of a p-type semiconductor provided at the junction between said insulation film and said electrode area. The electrode area is composed of a monocrystalline metal and constitutes a Shottky junction with said second semiconductor area.
摘要:
A semiconductor device including a semiconductor substrate having a first conductivity type, in which a metal electrode is formed on the semiconductor substrate to form a Schottky junction therebetween, and a gate electrode is arranged adjacent to the Schottky junction via an insulating film.
摘要:
Es wird ein hinsichtlich Herstellung und Betriebseigenschaften verbesserter Aufbau von Bipolartransistoren, vorzugsweise von vertikalen PNP-Transistoren, angegeben. Als Emitter wird dabei ein Schottky-Kontakt (72) vorgesehen, der auf einem jeweils zugehörigen Basisgebiet (59) mit relativ niedriger Dotierungskonzentration in Form einer Metallbelegung aufgebracht wird. Damit lassen sich vorteilhaft, z.B. in einem konventionellen NPN-Bipolarprozeß, komplementäre Bipolartransistoren (25, 27) mit hoher Pakkungsdichte und insbesondere verbesserten Eigenschaften der PNP-Transistoren (25) aufbauen.
摘要:
The field effect transistor FET (30) in accordance with the invention includes a substrate or layer (31) in which areas in which transistors are formed are separated by shallow isolation trenches (32) formed of an oxide or other insulative material. Metal source and drain deposits (33), preferably of tungsten, extend into the substrate or layer (31) for a distance beyond shallow junction structures (34), adjacent to the source and drain (33) and serving to connect the source and drain to the conduction channel of the FET which extends between them. Gate (35) of N+ polysilicon or polycide is insulated from the conduction channel by gate insulator (37), preferably formed of an oxide of the substrate material. Gate oxide (37) extends over the shallow junctions structure (34) between the metal source and drain deposits (33). Oxide gate sidewalls (38) cover the region between the gate edges and the edge of the metal source and drain deposits (33). The gate sidewalls (38) are also preferably covered with a thin (e.g. 40 nm) nitride spacer (39). Optionally, a cap of polycide or metal such as tungsten (particularly if polycide is used for the gate) can be provided on the gate. This ultra-short channel FET provides a combination of a shallow junction for injection of carriers into a conduction channel and a Schottky barrier below the shallow junction with a lowered barrier height to reduce the depletion region and punch-through effects. A preferred method of fabricating this structure which includes both etching and metal deposition selectively on only semiconductor material, thus allowing use of only a single patterning step with registration tolerances comparable to channel length while allowing extremely high integration density, is also disclosed herein.
摘要:
A semiconductor device having a Shottky junction comprises: a first semiconductor area composed of an n-type semiconductor; a second semiconductor area composed of an n-type semiconductor of a higher resistance than in said first semiconductor area; an insulation film provided adjacent to said second semiconductor area and having an aperture therein; an electrode area provided in said aperture; and a third semiconductor area composed of a p-type semiconductor provided at the junction between said insulation film and said electrode area. The electrode area is composed of a monocrystalline metal and constitutes a Shottky junction with said second semiconductor area.
摘要:
A vertical field effect transistor (FET) (e.g., 20) disclosed which has a relatively short channel length and which reduces parasitic capacitance without employing a mesa isolation technique. A short channel length is achieved as a consequence of the fact that the source electrode (e.g., 56) of the FET is used as an etching and shadow mask to form two gate electrodes (e.g., 62), on the opposite sides of the source electrode, which are aligned with the sides of the source electrode. Parasitic capacitance is reduced because two of the contact pads (e.g., 82 and 84) of the FET are formed on a region of the semiconductor body (de.g., 24) of the FET whose electrical resistivity has been increased through the implantation of appropriately chosen ions.
摘要:
@ There is disclosed a film field effect transistor which can be operated at fast switching rates for use, for example, in video display applications. The transistor includes a body of silicon semiconductor material having a structure more ordered than amorphous material and less ordered than single crystalline material. The source and drain of the transistor comprise rectifying contacts formed on the body of silicon semiconductor material. Also disclosed are a method of making the transistor and an electronically addressable array system utilizing the transistor to advantage.
摘要:
The present invention is directed to a semiconductor device and a method of manufacturing the same. The semiconductor device comprises a first conductivity type semiconductor substrate (31) with first and second major surfaces. A first region (32) of a second conductivity type is provided in a portion of the first major surface of the substrate (31). A second region (33) of the second conductivity type is located in a portion of the second major surface of the substrate (31). A third region (34) of the first conductivity type is provided in the second region (33). An insulation film (35) is located on the surface of the second region (33) and extends to cover portions of the surfaces of the substrate (31) and the third region (34), wherein the insulation film (35) is disposed at a position substantially corresponding to the first region (32). A control electrode (36) is disposed on the insulation film (35) and a first electrode is disposed on the second major surface and extends on the third region (34) and the second region (33). A second electrode (38) is disposed on the first major surface and extends on the first region (32) and on a fourth region (58) of the first conductivity type. The area of the fourth region (58) is smaller than that of the first region (32). Hence, it is possible to reduce a current flowing in a parasitic diode formed by the second region (33) and the semiconductor substrate (31). The semiconductor device is particularly suitable for high-frequency use.
摘要:
A MOSFET device is constructed with an integrated Schottky diode clamp connected between the source or drain terminal and the bulk terminal. In an illustrative implementation, one or more MOSFETs are formed in an n-well located in a p-type silicon substrate. Each drain is formed by a p+ region underlying a portion of a metal-silicide layer. In one embodiment, the p+ region underlies an edge of the metal-silicide; in another embodiment, the p+ region underlies opposing edges of the metal-silicide, such that a portion of the metal-silicide contacts the n-well. Each source is formed by a p+ region underlying a layer of metal-silicide. Each gate includes a layer of p+ or n+ polycrystalline silicon clad with a layer of metal-silicide, the gates being separated from the n-well by a layer of oxide. In comparison to p-n junction diodes, the integrated Schottky diodes more effectively limit excess voltages applied to MOSFETs. The clamping performed by the invention reduces wearout and other deleterious effects of excess voltage.