Question

How does the conductivity of an intrinsic semiconductor change when temperature rises?

Options

• It remains unchanged because no holes are formed.

• It increases only when impurity atoms are intentionally added.

• It decreases as electrons cross the energy gap.

• It increases as the number of electrons and holes increases.

Answer 1

As temperature rises, more electrons cross the energy gap and become free charge carriers. This also creates more holes, so conductivity increases.