The P-N junction depletion layer is made up o | vedclass

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(D) When $p$-type and $n$-type semiconductors are joined,the electrons in the $n$-type region diffuse into the $p$-type region across the junction,whe

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Neither holes nor electrons

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(D) When $p$-type and $n$-type semiconductors are joined,the electrons in the $n$-type region diffuse into the $p$-type region across the junction,whereas holes in the $p$-type region diffuse into the $n$-type region across the junction.This diffusion process leaves behind immobile ionized impurity atoms (positive ions on the $n$-side and negative ions on the $p$-side) near the junction.Because these ions are fixed in the crystal lattice and cannot move,the depletion region is essentially devoid of mobile charge carriers (free electrons and holes).Therefore,the depletion layer consists of immobile ions,and it contains neither free electrons nor free holes.

The $P-N$ junction depletion layer is made up of .......

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