Abstract:
There is described a method of subdividing a semiconductor wafer with trenches (203) in order to provide separate, electrically isolated regions that can be used to hold components that operate at different voltages. There is also described a masking and etching process of forming collector and emitter regions of a lateral bipolar transistor, from a layer of polysilicon deposited on a patterned later of silicon dioxide.
Abstract:
This invention relates to a semiconductor device consisting of one or more logic gates, resistors and high voltage devices fabricated from silicon carbide or other related materials and to methods for fabricating the same. The logic gates are formed using integrated injection logic (IIL) structure, in which a single logic cell includes a constant current source transistor (I) and a multi-collector switch transistor (II) formed on a common silicon carbide substrate (10).
Abstract:
Formulations for voltage switchable dielectric materials include two or more different types of semiconductive materials uniformly dispersed within a dielectric matrix material. The semiconductive materials are selected to have different bandgap energies in order to provide the voltage switchable dielectric material with a stepped voltage response. The semiconductive materials can comprise inorganic particles, organic particles, or an organic material that is soluble in, or miscible with, the dielectric matrix material. Formulations optionally can also include electrically conductive materials. At least one of the conductive or semiconductive materials in a formulation can comprise particles characterized by an aspect ratio of at least 3 or greater.
Abstract:
A method for recovery of degradation caused by avalanche hot carriers is provided that includes subjecting an idle bipolar transistor exhibiting avalanche degradation to a thermal anneal step which increases temperature of the transistor thereby recovering the avalanche degradation of the bipolar transistor. In one embodiment, the annealing source is a self-heating structure that is a Si-containing resistor that is located side by side with an emitter of the bipolar transistor. During the recovering step, the bipolar transistor including the self-heating structure is placed in the idle mode (i.e., without bias) and a current from a separate circuit is flown through the self-heating structure. In another embodiment of the present, the annealing step is a result of providing a high forward current (around the peak fT current or greater) to the bipolar transistor while operating below the avalanche condition (V CB of less than 1 V). Under the above conditions, about 40% or greater of the degradation can be recovered. In yet another embodiment of the present invention, the thermal annealing step may include a rapid thermal anneal (RTA), a furnace anneal, a laser anneal or a spike anneal.
Abstract:
Disclosed is a bipolar transistor and a method of forming the transistor, where the transistor includes a collector (12) in a substrate (10), an intrinsic base (14) above the collector, an extrinsic base adjacent the intrinsic base, and an emitter (130) above the intrinsic base. The extrinsic base includes extrinsic base implant regions (82, 172, 192) adjacent the intrinsic base, when viewed in cross-section. The transistor is formed by patterning an emitter pedestal (50) for the lower portion of the emitter on the substrate above the intrinsic base. The extrinsic base is formed in regions not protected by the emitter pedestal. Subsequently, the emitter, associated spacers (180) and a silicide region (220) are formed. The silicide, extrinsic base and emitter are all self-aligned with each other.
Abstract:
The invention relates to a BiCMOS device comprising a substrate having a first type of conductivity and a number of active regions that are provided therein and are delimited in a lateral direction by flat field-insulating regions. Vertical npn bipolar epitaxial base transistors are disposed in a first partial number of the active regions while vertical pnp bipolar epitaxial base transistors are arranged in a second partial number of the active regions of the BiCMOS device. One transistor type or both transistor types are provided with both a collector region and a collector contact region in one and the same respective active region. In order to improve the high frequency characteristics, an insulation doping region that is configured so as to electrically insulate the collector and the substrate is provided between the collector region and the substrate exclusively in a first transistor type in which the type of conductivity of the substrate corresponds to that of the collector region. In addition, the collector region of the first transistor type or both transistor types is laterally delimited by the flat field-insulating regions.
Abstract:
Erläutert wird unter anderem eine integrierte Schaltungsanordnung (100), die einen npn-Transistor (102) und einen pnpTransistor (104) enthält. Es entstehen Transistoren mit hervorragenden elektrischen Eigenschaften, wenn der pnp- Transistor eine Aussparung (142) enthält, die die Breite des mitteranschlussbereiches (120) des pnp-Transistors begrenzt und das elektrisch leitfähige Material des Anschlussbereiches (120) die Aussparung (142) lateral überlappt.
Abstract:
A Darlington transistor has a semiconductor collector region of one conductivity type adapted to form a collector for the device. A conductive collector contact and a semiconductor base region of opposite conductivity type are connected to the collector region. First and spaced apart second semiconductor emitter regions of the one conductivity type are connected to the base region and a first conductive emitter contact is connected to the first emitter region with a second conductive emitter contact connected to the second emitter region. A first conductive base contact is connected to the base region and is conductively connected to the first emitter contact. A second conductive base contact is conductively isolated from the first base contact and is connected to the base region. A resistive trench region extends at least partly into the base region for resistively separating the base region into a first base region communicating with the first emitter contact and the second base contact, and a second base region communicating with the first base contact and the second emitter contact.