A) electrons
B) protons
C) mobile charge carriers
D) immobile ions
Correct Answer: D
Solution :
When a piece of p-type material is in contact with n-type material, then to bring Fermi level in a line, electrons in conduction band on n-type side travel across the junction and leave the positively ionised impurity atoms unneutralized. Consequently, there is a positively charged region adjacent to the junction in n-type material. On p-type side, the electrons which have traversed the boundary recombine with positive holes in the valence band. Near to the junction on p-type side, there is a layer of unneutralised negatively ionised trivalent impurity which forms a negatively charged region. This region around the junction is called charge, depletion region or space charge region.
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