Carbon, silicon and germanium have four valence electrons each. These are characterized by valence and conduction bands separated by energy band gap respectively equal to $ \left(E_{g}\right)_{C},\left(E_{g}\right)_{S i} $ and $ \left(E_{g}\right)_{G e} . $ Which of the following statements is true?

Question

Carbon, silicon and germanium have four valence electrons each. These are characterized by valence and conduction bands separated by energy band gap respectively equal to $ \left(E_{g}\right)_{C},\left(E_{g}\right)_{S i} $ and $ \left(E_{g}\right)_{G e} . $ Which of the following statements is true?, $ \left(E_{g}\right)_{S i} < \left(E_{g}\right)_{G e} < \left(E_{g}\right)_{C} $, $ \left(E_{g}\right)_{C} \left(E_{g}\right)_{S i} $, $ \left(E_{g}\right)_{C}>\left(E_{g}\right)_{S i}>\left(E_{g}\right)_{G e} $, $ \left(E_{g}\right)_{C}=\left(E_{g}\right)_{S i}=\left(E_{g}\right)_{G e} $

MARKS App · Accepted Answer

The energy band gap is maximum for carbon, less for silicon and least for germanium. The energy band gap, Eg, is determined from the linear part of the optical absorption spectral. Therefore, we must remember the basic idea of energy band gap for common elements. E g C > E g S i > E g G e

Search any question & find its solution

Looking for more such questions to practice?