摘要:
The invention deals with a semiconductor device which comprises a semiconductor substrate (11) of a first conductivity type, a semiconductor region (14, 15) formed on said substrate, and a first insulation film (120, 77) provided between said semiconductor region and said semiconductor substrate, wherein said semiconductor substrate is isolated by said insulation film from a polycrystalline silicon layer (79, 121) formed in the periphery of said semiconductor region (14, 15) thereby to reduce the parasitic capacitance, and wherein said insulation film (79, 121) is stretched and arranged on the lower side of said semiconductor region.
摘要:
Die Erfindung betrifft einen Transistor mit einstellbarer Energiebarriere und mit ohmschen Kontakten, der eine n + pn- oder p + np-Dreischichtstruktur (1, 2, 3) mit so dünn ausgebildeter mittlerer Schicht (2) (Basis) aufweist, daß bereits ohne äußbere, an die Elektroden angelegte elektrische Spannung bei der gegebenen Dotierung dieser Schicht (2) ihr gesamter Bereich an freien Ladungsträgern verarmt ist. Für die Dotierungsdichten N von Emitter (E)-, Basis (B)-und Kollektorzone (C) gilt: N E > N B > N c . Die Steuerung des Kollektorstromes erfolgt über die Änderung einer Energiebarriere für Majoritätsträger mit einer angelegten Basis-Emitter-Spannung im Gegensatz zum Bipolartransistor, bei dem die Kollektorstromsteuerung durch Änderung der Minoritätsträgerdichte in der Basis mit einer angelegten Basis-Emitter-Spannung erfolgt. Der Anwendungsbereich erstreckt sich auf diskrete bipolare Halbleiterbauelemente und auf integrierte Schaltungen; Verwendung als Verstärker, Schalter, Mischer, Oszillator und Temperatursensor.
摘要:
Disclosed is a self-aligned process for providing an improved bipolar transistor structure. The process includes the chemically etching of an intermediate insulating layer (10) to undercut another top layer (11) of a different insulating material in a self-aligned emitter process wherein the spacing of the emitter contact to the polysilicon base contact is reduced to a magnitude of approximately 0.2 to 0.3 micrometers. In addition, in the process an emitter plug (14) is formed to block the emitter region (12) from the heavy P+ ion dose implant of the extrinsic base (19).
摘要:
Disclosed is a self-aligned process for providing an improved bipolar transistor structure. The process includes the chemically etching of an intermediate insulating layer (10) to undercut another top layer (11) of a different insulating material in a self-aligned emitter process wherein the spacing of the emitter contact to the polysilicon base contact is reduced to a magnitude of approximately 0.2 to 0.3 micrometers. In addition, in the process an emitter plug (14) is formed to block the emitter region (12) from the heavy P+ ion dose implant of the extrinsic base (19).
摘要:
A semiconductor device of the invention includes a first conductive type semiconductor base substrate (1,2); and a switching mechanism (6,7,10) which is formed on a first main surface of the semiconductor base substrate and switches ON/OFF a current. In the semiconductor base substrate, a plurality of columnar hetero-semiconductor regions (4) are formed at spaced intervals within the semiconductor substrate, and the hetero-semiconductor regions are made of a semiconductor material having a different band gap from the semiconductor substrate and extend between the first main surface and a second main surface opposite to the first main surface.
摘要:
An exemplary edge termination structure maintains the breakdown voltage of the semiconductor device after it has been sawed off the wafer and packaged by creating an electric field stop layer at a periphery of the semiconductor device. The electric field stop layer has a dopant concentration higher than that of the layer in which an edge termination is implemented, such as a drift layer or a channel layer. The electric field stop layer may be created by selectively masking the peripheries of the device during the device processing, i.e., mesa etch, to protect and preserve the highly doped material at the peripheries of the device.
摘要:
It is an object to provide a method for improving the quality of an SiC layer by effectively reducing or eliminating the carrier trapping centers by high temperature annealing and an SiC semiconductor device fabricated by the method. A method for improving the quality of an SiC layer by eliminating or reducing some carrier trapping centers comprising the steps of: (a) carrying out ion implantation of carbon atoms (C), silicon atoms, hydrogen atoms, or helium atoms into a shallow surface layer (A) of the starting SiC crystal layer (E) to introduce excess carbon interstitials into the implanted surface layer, and (b) heating the layer for making the carbon interstitials (C) to diffuse out from the implanted surface layer (A) into a bulk layer (E) and for making the electrically active point defects in the bulk layer inactive. After the above steps, the surface layer (A) can be etched or mechanically removed. A semiconductor device according to the invention is fabricated by the method.