For semiconductor the energy (Eg) band gap (at room temperature) between valence band and conduction band is ______.
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A.
Eg = 7eV
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B.
Eg = 0 eV
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C.
Eg > 3eV
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D.
Eg < 3eV
Correct Answer:
D. Eg < 3eV
Explanation:
A semiconductor is defined as a material with an energy band gap (Eg) that is typically less than 3.0 eV at room temperature. This relatively small gap allows electrons to be thermally excited from the valence band to the conduction band, enabling electrical conductivity that falls between that of an insulator and a conductor. In contrast, insulators generally possess a band gap greater than 3.0 eV or 4.0 eV, which prevents electronic transition under normal conditions. Therefore, for a semiconductor, the energy band gap is Eg < 3eV.
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