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Question

Carbon, Silicon and Germanium atoms have limn valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)c,(Eg)si and (Eg)Ge respectively. Which one of the following relationship is true in their case?

A
(Eg)C>(Eg)si
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B
(Eg)C<(Eg)si
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C
(Eg)C=(Eg)si
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D
(Eg)C<(Eg)Ge
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Solution

The correct option is A (Eg)C>(Eg)si
As carbon is much more electronegative than silicon and germanium, thus the electrons are strongly bound with the carbon atom compared to that in silicon and germanium. Thus more energy is required for the electron in carbon to jump from valence band to conduction band.
The correct order of energy band gaps, (Eg)C>(Eg)si>(Eg)Ge

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