Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (E_g)_C, (E_g)_Siand (E_g)_Ge. Which of the following statements is true?
(a) (E_g)_Si < (E_g)_Ge < (E_g)_C(b) (E_g)_C < (E_g)_Ge > (E_g)_Si(c) (E_g)_C > (E_g)_Si > (E_g)_Ge(d) (E_g)_C = (E_g)_Si = (E_g)_Ge

Solution

(c) is the correct statement.

Out of the given three elements, energy band gap is maximum for carbon, less for silicon and least for germanium.

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