Current in the semiconductors is caused by the movement of:
Correct answer: D. Both electrons and holes
- A. Protons
- B. Electrons only
- C. Holes only
- D. Both electrons and holes
Explanation
In semiconductors, current is generated by the movement of charge carriers: electrons and holes. Electrons, which are negatively charged, move through the conduction band, while holes, which are effectively positive charge carriers due to the absence of electrons, move through the valence band. Both types of carriers are essential for the flow of current. Protons do not contribute to current flow as they are locked within the atomic nucleus and do not move. Thus, the correct answer is that current in semiconductors is caused by the movement of both electrons and holes.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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