The Fermi energy of an n-type Si semiconductor is lower than that of a p-type Si semiconductor
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It is false. The Fermi level of an n-type semiconductor is higher than that of a p-type semiconductor.
"Fermi level" is a term that refers to the top level of the collection of electron energy levels present at absolute zero temperature. The Fermi level is that top level of a surface at absolute zero above which the electrons will not have enough energy to rise.
The n-type semiconductors contain pentavalent impurities which donate free electrons and so their number increases in the conduction band. So, the number of electrons is more in the conduction band than the number of holes present in the valence band. So, the Fermi levels which represent the occupation of energy levels lies closer to the conduction band than the valence band for the n-type semiconductor.
The p-type semiconductors have added trivalent impurities to them that creates holes in the valence band which are ready to accept electrons. So, the number of holes in the valence band is more than the free electrons in the conduction band. So, the Fermi level for p-type semiconductor is close to the valence band than the conduction band.
"Fermi level" is a term that refers to the top level of the collection of electron energy levels present at absolute zero temperature. The Fermi level is that top level of a surface at absolute zero above which the electrons will not have enough energy to rise.
The n-type semiconductors contain pentavalent impurities which donate free electrons and so their number increases in the conduction band. So, the number of electrons is more in the conduction band than the number of holes present in the valence band. So, the Fermi levels which represent the occupation of energy levels lies closer to the conduction band than the valence band for the n-type semiconductor.
The p-type semiconductors have added trivalent impurities to them that creates holes in the valence band which are ready to accept electrons. So, the number of holes in the valence band is more than the free electrons in the conduction band. So, the Fermi level for p-type semiconductor is close to the valence band than the conduction band.
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