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  4. Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)c,(Eg)S i and (Eq) Ge respectively. Which one of the following relationships is true in their case?

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Q. Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $\left(E_{g}\right)_{c},\left(E_{g}\right)_{S i}$ and $\left(E_{q}\right)_{ Ge }$ respectively. Which one of the following relationships is true in their case?

JIPMERJIPMER 2007Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

Carbon, silicon and germanium are semiconductors.
$\left(E_{g}\right)_{C}=5.2\, eV $
$\left(E_{g}\right)_{S i}=1.21\, eV $
$\left(E_{g}\right)_{ Ge }=0.75\, eV$
Thus, $\left(E_{g}\right)_{C}>\left(E_{g}\right)_{S i}$ and $\left(E_{g}\right)_{C}>\left(E_{g}\right)_{G e}$
NOTE : Elements carbon, silicon and germanium are found in IVA group of periodic table.