Why don''t diode as a battery?, Physics

Why because it is not a source as Li-ion battery. If we want to measure the voltage(build in voltage) with in the diode we have to use the external source. We can''t directly measure the voltage present in the diode with the multimeter. Why because if we use the multimeter in the metallic contact the two potentials will be cancel out. More precisely diode is neutral.

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