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The conductivity $\sigma$ of a semiconductor increases with temperature because
- A.The number of free charge carriers increases
- B.The number of free charge carriers decreases
- C.The mass of the charge carriers decreases
- D.The crystal lattice expands
Show correct answer & step-by-step solution
Correct answer: A — The number of free charge carriers increases
Solution
As temperature increases, more thermal energy is available to break covalent bonds in the semiconductor crystal. This generates more electron-hole pairs, which increases the total number of charge carriers and thus the conductivity .
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