Question:
The conductivity of semiconductor increases with increase in temperature because
The conductivity of semiconductor increases with increase in temperature because
Updated On: Apr 19, 2024
- both number density of charge carriers and relaxation time increase
- number density of charge carriers increases
- number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density
- relaxation time increases
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The Correct Option is C
Solution and Explanation
As temperature increases the number density of charge carries increases according to the equation
$n=CT^{\frac{3}{2}}. exp\left(-\frac{E}{2}kT\right).$ Thus as temperature increases, the number density of charge carries increase resulting in conductivity of semiconductors.
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Concepts Used:
Semiconductors
Semiconductors are a crystalline solid materials, whose electrical conductivity lies between a conductor and an insulator. Semiconductors are mainly used in the manufacturing of electronic devices like capacitors, transistors, diodes, Integrated circuits, etc.
Properties of Semiconductor:
- Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
- Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
- Lesser power losses.
Uses of Semiconductor:
- Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
- Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.