Diffusion capacitance in a diode.
Why do we talk of diffusion capacitance only in the case of semiconductors? Though the carriers are diffused across the junction in a typical device, the derivation proceeds from the fact that a certain amount of charge crosses the junction in certain amount of time. But this even happens in the case of metals. In any conductor charge has to cross a junction to constitute a current.
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Ramani AswathIn a metal there is no 'junction'. Free electrons in the metal conduct the current. There is no barrier, holes or such which exist in a semi conductor with its diffused junctions.
The detailed explanation can be seen here:
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