Question

What is the order of Band gap in the following materials?

• A. Conductors>Insulators> Semiconductors
• B. Insulator> Semiconductors>Conductors
• C. Conductors>Semiconductors> Insulators
• D. Semiconductors>Conductors> Insulators

Answer 1

The correct option is B

Insulator> Semiconductors>Conductors

Lesser the energy gap between conduction band and valence band more is the conductivity of electricity.

If the gap is more. It is difficult for e- to jump from valence band to conduction band. So, insulators are least conductors of electricity. The energy gap between valence band and conduction band is very less or zero in conductors, they are very good conductors of electricity.

The order for energy gap is

Insulator$>$ Semiconductors$>$Conductors