Question

In a semiconductor, separation between conduction and valence band is of the order of

• A. $100eV$
• B. $10eV$
• C. $1eV$
• D. $0eV$

Answer 1

The correct option is C

$1eV$

1. In a conductor, the separation between the conduction band and valence band is zero.
2. In an insulator, the separation between the conduction band and valence band is greater than $1eV$.
3. In a semiconductor, the separation between the conduction band and valence band is $1eV$.

Also, we know,

1. For semiconductor germanium, the separation between the conduction band and valence band is ${\left(E_g\right)}_{Ge}=0.67eV$
2. And for semiconductor silicon, the separation between the conduction band and valence band is ${\left(E_g\right)}_{Si}=1.1eV$
3. We can see that these two values lie closer to $1eV$.

Therefore, the separation between the conduction band and valence band is of the order of $1eV$

Hence, option C is the correct option.