KCET2019PhysicsSemiconductors
The conductivity of semiconductor increases with increase in temperature because
Options
- Aboth number density of charge carriers and relaxation time increase
- Bnumber density of charge carriers increases
- Cnumber density of current carriers increases, relaxation time decreases but effect of decrease in relaxation t
- Drelaxation time increases
Correct answer
C. number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation t
Step-by-step solution
(C) As temperature increases the number density of charge carries increases according to the equation ( n =C T^ 3 2 ) ( (- E 2 k T ) ). Thus as temperature increases, the number density of charge carries increase resulting in conductivity ofsemiconductors.