Bbc Brown Boveri Ag

Bbc Brown, Boveri & Company, Limited

Asea Brown Boveri Inc.

Bbc, Brown, Boveri & Cie

Thomas Vlasak

Andre A Jaecklin

Peter Roggwiller

Jan Voboril

Ezatoll Ramezani

Bruno Adam

Paul Van Iseghem

Wolfgang Zimmermann

Rudolf Veitz

In a semiconductor component with turn-off facility of the GTO type with direct pressure contact, a balancing of the local pressure distribution in the region of the cathode fingers (7) which results in an improved alternating load resistance and also in an extension of the allowable pressure range is achieved by structural matching of the anode metallization (4) to the gate-cathode structure on the cathode side.

Semiconductor component with turn-off facility

In a high-reverse-voltage GTO thyristor, a negative beveling (6) with comparatively high beveling angle (.alpha.) is possible as edge contouring as a result of separating the p-type base layer into a central p-type base layer (4) of small depth and high edge concentration and a p-type base edge layer (5) of greater depth and lower edge concentration. The production of the two p-type base layers (4, 5) is preferably carried out by simultaneous diffusion of two acceptors with different diffusion constants.

Method of making a gate turn-off thyristor using a simultaneous

Turn-off thyristor

In a controllable power semiconductor component which consists of a plurality of parallel-connected individual elements disposed adjacently to one another, the control contacts of which are connected to a common gate, different line resistances between gate and control contacts are compensated in order to achieve a uniform loading on all individual elements. In a GTO thyristor, the compensation is preferably achieved by adjusting the gate trough resistance (R.sub.G) in the p-type base (3) between gate contact (5) and n-type emitter (2).

Controllable power semiconductor

A method for producing large-area power semiconductor components, wherein at least two irradiation processes (neutron irridiation, ion implantation electron, .gamma.or proton irradiation) are used to produce the basic doping, to introduce deep pn junctions and to introduce recombination centers. It is precisely for the critical process steps (p-base, n-type stop layer) that the improved homogeneity of the layers signifies a higher yield and improved limit data for the finished components.

Method for producing large-area power semiconductor components

A method for the locally selective doping of a planar substrate, essentially made of silicon, for the production of semiconductors using a diffusion process, in which aluminum as the doping additive is applied by vaporizing in a vacuum at temperatures above 500.degree. C. to the substrate surface areas to be doped and permitted to diffuse into the substrate. A part of the substrate surface is masked in order to prevent the doping of the substrate beneath the mask, by forming a SiO.sub.2 layer on the substrate and abutting a masking plate against the SiO.sub.2 layer.

Method for the doping of supporting silicon plates for the manufacture

A semiconductor component, preferably a thyristor, having emitter short-circuits in the cathode space. The emitter short-circuits are preferably arranged in a uniform fashion about the cathode space and, when formed of a material having &lt;111&gt; oriented crystals are arranged in ternary symmetry about the cathode or in multiples of three. In the case of material having &lt;001&gt; oriented crystals the emitter short-circuits are arranged in a quarternary symmetry or in multiples of four.

Semiconductor component having emitter short circuits

Semiconductor components containing at least one junction and at least one weakly N- or P-conducting zone containing from 10.sup.13 to 2.5 .times. 10.sup.14 doping atoms/cm.sup.3 are prepared by diffusing dopant atoms at elevated temperatures into appropriate zones of a semiconductor crystal from a nickel film containing the dopant deposited on the surface of the crystal and then cooling the in-diffused semiconductor crystal to room temperature at a rate sufficient such that the specific resistance of the weakly doped zone is not changed by the nickel atoms which diffuse into the semiconductor crystal along with the doping atom.

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Birr, Switzerland

Thomas Vlasak