JEE Advanced · PhysicsEasy
The conductivity 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
- In a semiconductor, electrons are initially bound in the crystal lattice at low temperatures.
- As temperature increases, thermal energy allows more electrons to break their covalent bonds.
- This process generates additional electron-hole pairs, which act as free charge carriers.
- The conductivity is directly proportional to the number of these free charge carriers.
- Hence the answer is (A).
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