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NEET 2005
Exam
NEET
Year
2005
Subject
Physics
Chapter
Semiconductors

NEET 2005 · Physics · Semiconductors

Carbon, silicon and germanium atoms have four valence electrons...

Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated energy band gaps represented (Eg)C,(Eg)Si\left(E_g\right)_C,\left(E_g\right)_{S i}, and \left(E_g\right)_{G e} respectively. Which one of the following relationship is true in their case?

Options

  1. A\left.\left(\mathrm{E}_g\right)_{\mathrm{C}}>\mathrm{E}_g\right)_{\mathrm{Si}}
  2. B\left.\left(\mathrm{E}_g\right)_{\mathrm{C}} < \mathrm{E}_g\right)_{\mathrm{Si}}
  3. C\left.\left(\mathrm{E}_g\right)_{\mathrm{C}}=\mathrm{E}_g\right)_{\mathrm{Si}}
  4. D\left(\mathrm{E}_g\right)_{\mathrm{C}}>(Eg)Ge\left(\mathrm{E}_g\right)_{\mathrm{Ge}}

Correct answer

A. \left.\left(\mathrm{E}_g\right)_{\mathrm{C}}>\mathrm{E}_g\right)_{\mathrm{Si}}

Step-by-step solution

Band gap of carbon is 5.5eV5.5 \mathrm{eV} while that of silicon is 1.1 \mathrm{eV}\left(E_g\right)_C>\left(E_B\right)_S
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