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Introducing the ion implantation technology required for the IGBT process.
P+,N+ Field Stop layer
An ion implanter equipped with a plasma source IHC is used to form the P +, N + Field Stop layer. IHC is an abbreviation for Indirect Heat Current. The feature is that the filament is not directly exposed to the plasma surface, so it has a long life.
The principle is that thermions are emitted from the filament, which causes the cathode to collide. After that, electrons are emitted from the cathode, and while being reflected by the repeller, the electrons collide with the introduced gas and form plasma.
This mechanism is used in ULVAC’s ion implanter SOPHI-400.
