Semiconductors Question 9

Question 9 - 31 January - Shift 1

The effect of increase in temperature on the number of electrons in conduction band $(n_e)$ and resistance of a semiconductor will be as:

(1) Both $n_e$ and resistance decrease

(2) Both $n_e$ and resistance increase

(3) $n_e$ increases, resistance decreases

(4) $n_e$ decreases, resistance increases

Show Answer

Answer: (3)

Solution:

Formula: Intrinsic semiconductor

As temperature increases, more electron excite to conduction band and hence conductivity increases, therefore resistance decreases.