Can the barrier voltage of a diode act as a voltage source?

Can the barrier voltage of a diode act as a voltage source?
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Answer :

No, we don not consider the barrier voltage of a diode to beable to act as a voltage source. The barrier voltage arises duringconstruction of the p-n junction, and it results from chargeseparation. Separating charges results in voltage, but thisdifference of potential cannot be tapped as a voltage sourcebecause it cannot supply current the way we understand conventionalvoltage sources are able do.
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