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 $(E_{g})_{S}$ i, $(E_{g})_{c}$ and $(E_{g})_{G e}$ . Which of the following statements is true?

(E_{g})_{S i} < (E_{g})_{G e} < (E_{g})_{C}

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(E_{g})_{C} = (E_{g})_{S i} = (E_{g})_{G e}

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(E_{g})_{C} > (E_{g})_{S i} > (E_{g})_{G e}

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(E_{g})_{C} < (E_{g})_{G e} > (E_{g})_{S i}

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Solution

The correct option is C $(E_{g})_{C} > (E_{g})_{S i} > (E_{g})_{G e}$
The energy bandgap

For carbon (Diamond), $E_{g} ≅ 5.5 e V$

Silicon $E_{g} ≅ 1.14 e V$

Germanium $E_{g} ≅ 0.67 e V$

Out of carbon, germanium, and silicon, carbon has the maximum energy bandgap whereas germanium has the least energy bandgap.

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

Final Answer: (𝒄)

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Q. 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})_{S i}

and

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.Which of the following statements is true?

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(d) (Eg)C= (Eg)Si = (Eg)Ge

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