When semi-conductors doped in _ then they are p-type
Correct answer: B. Trivalent
- A. Pentavalent
- B. Trivalent
- C. Both a and b
- D. None of these
Explanation
When a trivalent impurity (like Boron, Aluminium, Gallium, Indium) is added to an intrinsic semiconductor (like Silicon or Germanium), it creates a p-type semiconductor. The trivalent impurity has only three valence electrons, leaving a hole in the crystal lattice. These holes act as positive charge carriers, hence the name "p-type"
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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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