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US 5,668,385 AGranted
Power semiconductor component with transparent emitter and stop layer
AssigneeAsea Brown Boveri AG
InventorsFriedhelm Bauer, Klas Lilja
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Abstract
A power semiconductor component is specified which provides for a significant reduction in the thickness of the semiconductor substrate (1) whilst at the same time optimizing the switching losses. A transparent emitter (6) and a stop layer (7) are arranged to provide a thin semiconductor and optimized switching losses. The means can be used both in semiconductor switches such as IGBT, MCT or GTO and in diodes.
Claims23
A power semiconductor component, in particular for high blocking voltages comprising:
- a semiconductor substrate into which a number of layers of first and second conductivity types are diffused between a first main area and a second main area;
- a cathode electrode formed on the first main area, and an anode electrode formed by a metallization covering the second main area;
- a transparent emitter of said first conductivity type diffused in the substrate adjacent the anode electrode, an impurity concentration and a thickness of said transparent emitter being chosen such that at least 50% of a total current flowing through the transparent emitter is covered by minority carriers;
- and
- a stop layer of said second conductivity type formed between the transparent emitter and the cathode electrode for reducing the thickness of the semiconductor substrate and for minimizing switching losses.
2 more elements
Dependencies are inferred from the claim text.