摘要:
A conductivity-modulation MOSFET employs a substrate (30) of an N type conductivity as its N base. A first source layer (34) of a heavily-doped N type conductivity is formed in a P base layer (32) formed in the N base (30). A source electrode (38) electrically conducts the P base (32) and the source (34). A first gate electrode (36) insulatively covers a channel region (CH1) defined by the N⁺ source layer (34) in the P base (32). A P drain layer (44) is formed on an opposite substrate surface. An N⁺ second source layer (46) is formed in a P type drain layer (44) by diffusion to define a second channel region (CH2). A second gate electrode (40) insulatively covers the second channel region (CH2), thus providing a voltage-controlled turn-off controlling transistor. A drain electrode (48) of the MOSFET conducts the P type drain (44) and second source (46). When the turn-off controlling transistor is rendered conductive to turn off the MOSFET a "shorted anode structure" is temporarily formed wherein the N type base (30) is short-circuited to the drain electrode (48), whereby case, the flow of carriers accumulated in the N type base (30) into the drain electrode is facilitated to accelerate dispersion of carriers upon turn-off of the transistor.
摘要:
A heterojunction bipolar transistor includes an emitter layer (11) of a first conductivity type, a base layer (12) of a second conductivity type adjacent to the emitter layer, a collector buffer layer (13) of the first conductivity type, and a collector layer (14, 15) arranged between the collector buffer layer and the base layer. The collector layer includes a first collector layer (14) formed at the side of the base layer and a second collector layer (15) arranged at the side of the collector buffer layer. The first collector layer is a semiconductor layer having an impurity concentration lower than that of the base layer. The second collector layer is a semiconductor layer of the second conductivity type having an impurity concentration higher than that of the first collector layer.
摘要:
An insulated gate bipolar transistor (IGBT) device incorporates a base contact (40a,40b) usable with an external circuit for depleting charge from the base (18) when stopping bipolar conduction, thereby increasing turn-off speed. Fabrication of the IGBT is described.
摘要:
An integrated light-triggered and light-quenched static induction thyristor and fabrication process thereof adapted in such a manner that an integrated SIPT operates in the normal mode in order to enhance current gain, tail current generated at the light-quenching time is reduced in order to enhance turn-off gain, and an buried-gate type of light-triggered static induction thyristor and a photodarlington circuit composed of a first and second static induction phototransistors are integrated on a high-resistivity substrate in order to permit manufacturing said thyristor compact as a whole in facilitated processes.
摘要:
Bipolar transistors are made by forming a base window through a dielectric layer overlying a substrate. In the wall of the base window a polysilicon layer is exposed. Subsequent processing involves the forming of various sidewall spacers within the base window to define the base and emitter regions. Since spacer formation requires no lithographic processing, there is no need to define very small features, such as the emitter, lithographically. The smallest feature which needs to be defined lithographically is the original base window which may be between 1 and 2 microns for emitter widths of 0.5 um or less.
摘要:
A semiconductor device comprising a p⁺ region (2) and an n⁺ region (3) forming a p⁺/n⁺ homojunction in a semiconductor layer (2, 3) formed between a semiconductor substrate (1) and a cap semiconductor layer (4) both of a wider band gap material than that of the semiconductor layer (2, 3). The p⁺ region (2) and the n⁺ region (3) are respectively provided with contact regions (6, 5), and a gate electrode (7) is formed on the cap layer (4). A tunneling current can flow between a two-dimensional electron gas (10) and a two-dimensional hole gas (11) induced at the heterojunction boundaries of the double heterojunction structure owing to an electric field applied to the semiconductor layer (2, 3). A buffer layer (71) of wide band gap semiconductor material can be further provided between the semiconductor substrate (1) and the semiconductor layer (2, 3) for reducing the leakage currents.
摘要翻译:在半导体衬底(1)和半导体衬底(1)之间形成的半导体层(2,3)中,包括形成ap +区域(2)和形成p + + / n +同结的n +区域(3) 以及比半导体层(2,3)更宽的带隙材料的帽半导体层(4)。 p +区域(2)和n +区域(3)分别设置有接触区域(6,5),并且在盖层(4)上形成栅电极(7)。 由于施加到半导体层(2,3)的电场,隧穿电流可以在双异质结结构的异质结边界处诱导的二维电子气(10)和二维空穴气体(11)之间流动, 。 可以在半导体衬底(1)和半导体层(2,3)之间进一步设置宽带隙半导体材料的缓冲层(71),以减少漏电流。
摘要:
Bipolartransistorstrukturen vom Typ npn mit extrem flachen Emitter/Basis-Zonen (2, 4) werden erhalten, wenn die Bildung der aktiven Basiszone (2) unter der Emitterzone (4) neben der Bor-Ionenimplantation mit einer Phosphor-Ionenimplantation mit etwas größerer Eindringtiefe erfolgt (Figur 1). Hierdurch wird der "Channeling"-Schwanz des Bordotierungsprofils umdotiert und die Basisweite W B drastisch reduziert. Die Erfindung wird bei der Herstellung hochintegrierter CMOS-Schaltungen verwendet.
摘要:
An insulated gate bipolar transistor (IGBT) device incorporates a base contact (40a,40b) usable with an external circuit for depleting charge from the base (18) when stopping bipolar conduction, thereby increasing turn-off speed. Fabrication of the IGBT is described.