The depletion region in PN-Junction carries:
Correct answer: D. No mobile charge carriers
- A. Positively charged
- B. Negatively charged
- C. Both positively and negatively charged
- D. No mobile charge carriers
Explanation
The correct option is (d) No mobile charge carriers. The depletion region in a PN-junction is characterized by the absence of mobile charge carriers. During the formation of the junction, electrons and holes recombine near the junction, creating a region devoid of free carriers, known as the depletion region. This region contains immobile positive ions from the N-type side and immobile negative ions from the P-type side, which balance each other, resulting in an electrically neutral region. Options (a), (b), and (c) are incorrect because they suggest a net charge that does not exist in the depletion region, which is neutral due to the equal presence of opposite charges.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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