Wats is the purpose of putting epitaxial layer on substrate

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Somashekhar

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Epitaxial layer.

Wats is the main purpose of putting the epitaxial layer on the substrate??
When exactly its used??
 

Epitaxial layer.

That is not so much about what the epi is, bur what it is not.

You would put an epi layer on top of a heavily doped handle
wafer to get a stiff substrate shunt, yet have a device layer
that can be sensibly doped and counter-doped for CMOS
transistors. The light doping needed for those, if the whole
wafer thickness was that, would be difficult to keep from
latchup without very dense ties.
 

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