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  4. Although carbon, silicon and germanium have same lattice structure and four valence electrons each, their band structure leads to the energy gaps as

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Q. Although carbon, silicon and germanium have same lattice structure and four valence electrons each, their band structure leads to the energy gaps as

Delhi UMET/DPMTDelhi UMET/DPMT 2010

Solution:

Band gap of silicon is $1.11\, eV$, of germanium is $0.67 \,eV$ and so the correct order of band gap is
$E_{g}(S i) > E_{g}(G e) < E_{g}(C)$.