Process for fabricating a semiconductor component
AssigneeABB Schweiz Holding AG
InventorsNorbert Galster, Stefan Linder
Life of this patent
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Abstract
In a process for fabricating a semiconductor component, in particular a semiconductor diode, a semiconductor substrate (1) is provided with metal layers (3, 4) in order to form electrode terminals and with passivation (2), and is exposed to particle irradiation (P) in order to adjust the carrier lifetime. This being the case, at least the metal layer (3) on the irradiation side and the passivation (2) are not applied until after the particle irradiation (P). As a result, a continuous defect region (5), which precludes undesired edge effects, is obtained in the semiconductor substrate (1).
Claims9
A process for fabricating a semiconductor component that retains a defect region that adjusts carrier lifetime, the process comprising:
- providing a semiconductor substrate having first and second surfaces;
- doping the semiconductor substrate to form doped regions of opposite polarities;
- after the doped regions have been formed, adjusting carrier lifetime by exposing the first surface of the semiconductor substrate to particle irradiation with one of a group consisting of hydrogen nuclei or helium nuclei, to produce the defect region so that the defect region extends into the substrate continuously and at least approximately parallel to at least one of the first and second surfaces;
- providing first and second metal layers on respective of the first and second surfaces of the semiconductor substrate, respectively, so as to form respective first and second electrode terminals, the providing of the first metal layer on the first surface being performed after the particle irradiation exposing step;
- and
- providing the semiconductor substrate with a passivation on the first surface, after the particle irradiation exposing step.
Dependencies are inferred from the claim text.