KCET · Physics · Semiconductors
The conductivity of semiconductor increases with increase in temperature because
- A both number density of charge carriers and relaxation time increase
- B number density of charge carriers increases
- C number density of current carriers increases, relaxation time decreases but effect of
decrease in relaxation time is much less than increase in number density - D relaxation time increases
Answer & Solution
Correct Answer
(C) number density of current carriers increases, relaxation time decreases but effect of
decrease in relaxation time is much less than increase in number density
Step-by-step Solution
Detailed explanation
(C)
As temperature increases the number density of charge carries increases according to the equation \( \mathrm{n}=C T^{\frac{3}{2}} \cdot \exp \)
\( \left(-\frac{E}{2} k T\right) \). Thus as temperature increases, the number density of charge carries increase resulting in conductivity
ofsemiconductors.
As temperature increases the number density of charge carries increases according to the equation \( \mathrm{n}=C T^{\frac{3}{2}} \cdot \exp \)
\( \left(-\frac{E}{2} k T\right) \). Thus as temperature increases, the number density of charge carries increase resulting in conductivity
ofsemiconductors.
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