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  4. Based on the energy band description, a solid can be classified as insulator the energy gap between the valance band and conduction band is

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Q. Based on the energy band description, a solid can be classified as insulator the energy gap between the valance band and conduction band is

J & K CETJ & K CET 2010Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

In insulators, the forbidden energy gap is quite large. For example, the forbidden energy gap for diamond is $ 6\,eV, $ which means that minimum of $6\, eV$ energy is required to make the electron jump from the completely filled valence band to conduction band.