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Carbon, silicon and germanium atoms have four valence electrons each. 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 relationships is true in their case ?

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${(E_{g})}_{C} > {(E_{g})}_{S i} > {(E_{g})}_{Ge}$

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

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

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

answer is A.

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Detailed Solution

Due to strong electronegativity of carbon, the gap in energy band will be highest in carbon, followed by silicon and germanium.

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