Question

What is the energy band gap of silicon and germanium respectively in eV?

• A. $1.1,0.7$
• B. $0.7,1.1$
• C. $-0.7,-1.1$
• D. $-1.1,-0.7$

Answer 1

The correct option is A

$1.1,0.7$

Explanation for correct option:

(a) $1.1,0.7$

Energy band gap:

• The energy difference between the bottom of the conduction band and the top of the valence band is referred to as the band gap.
• It's a region where no electron states exist.
• Measured generally in eV (electron volts).

Semiconductors:

• Silicon and germanium are widely used as semiconductors.
• The electron band gap of Silicon= $1.1\mathrm{eV}$
• The electron band gap of Germanium= $0.7\mathrm{eV}$

Explanation for incorrect options :

(B) $0.7,1.1$

• The electron band gap of Silicon= $1.1\mathrm{eV}$
• The electron band gap of Germanium= $0.7\mathrm{eV}$
• This option states $0.7,1.1$ to be the result.
• So this cannot be the correct option

(C) $-0.7,-1.1$

• The electron band gap of Silicon= $1.1\mathrm{eV}$
• The electron band gap of Germanium= $0.7\mathrm{eV}$
• This option states $-0.7,-1.1$ to be the result.
• So this cannot be the correct option

(D) $-1.1,-0.7$

• The electron band gap of Silicon= $1.1\mathrm{eV}$
• The electron band gap of Germanium= $0.7\mathrm{eV}$
• This option states $-1.1,-0.7$ to be the result.
• So this cannot be the correct option

Hence, the correct option is (A) i.e. $1.1\mathrm{eV},0.7\mathrm{eV}$ .