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JIPMER2007PhysicsSemiconductors

Carbon, silicon and germanium atoms have four valence electrons each. Their valence 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?

Options

  1. A(E_g )_ C (E_g )_ Si
  2. B(E_g^ )_ C = (E_g^ )_ Si
  3. C(E_g^ )_ C (E_g^ )_ Ge
  4. D(E_g )_ C (E_g )_ Si

Correct answer

A. (E_g )_ C (E_g )_ Si

Step-by-step solution

Carbon, silicon and germanium are semiconductors. aligned & (E_g )_ C =5.2 eV & (E_g )_ Si =1.21 eV & (E_g )_ Ge =0.75 eV aligned Thus, (E_g )_ C (E_g )_ Si and (E_g )_ C (E_g )_ Ge NOTE : Elements carbon, silicon and germanium are found in IVA group of periodic table.

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