In that region, N-type or P-type material is returned to its original insulating state. What is the Depletion Zone?Ī depletion region forms when no voltage is applied to the diode so electrons from the N-type material fill holes from the P-type material along the junction between the layers. Electrons from the N-type side fill the holes on the P-type side. This region is depleted of free electrons and holes. You can see the depletion region on either side of the diode junction. Combining the N-type and P-type material forms a P-N junction. Every time an electron moves into a hole, it creates another hole behind it since they move in opposite direction of electrons. ![]() Having holes means the absence of an electron and having a positive charge.
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