Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by ${(E_{g})}_{C}, {(E_{g})}_{si} and {(E_{g})}_{Ge},$ respectively. Which one of the following relationship is true in their case?

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${(E_{g})}_{C} > {(E_{g})}_{si}$

${(E_{g})}_{C} = {(E_{g})}_{si}$

${(E_{g})}_{C} < {(E_{g})}_{Ge},$

${(E_{g})}_{C} < {(E_{g})}_{si}$

answer is A.

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Detailed Solution

Forbidden energy gap for carbon is greater than that of silicon.

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