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When n type semiconductor is heated

Asked in CBSE AIPMT 1989 · Doping and carrier concentration

• (1) number of electrons increases while that of holes decreases
• (2) number of holes increases while that of electrons decreases
• (3) number of electrons and holes remain same
• (4) number of electrons and holes increases equally

Step-by-step solution

Why the other options are wrong

• (1) comes from heating cannot destroy holes; every electron promoted across the gap leaves a hole behind, so the two rise together.
• (2) comes from this has the same flaw in reverse: holes are not created without electrons.
• (3) comes from the numbers certainly change, since thermal energy generates new pairs continuously as the temperature rises.

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