Draw the energy band diagram of …
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Draw the energy band diagram of N type and P type semiconductor at temperature t > 0 k in this case of n-type SI semiconductor the donor energy level of slightly below the bottom of conduction band where the P type of semiconductor the acceptor of energy levels is slightly above the top of valence band and explain giving example what role do these energy level play in the conduction of valence bands
Posted by Sheetal Giri 4 years, 9 months ago
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Sia ? 4 years, 9 months ago
The donor energy level ED is just below the bottom of the conduction band. It contains the electrons due to added impurity atoms. At room temperature the electrons easily jump to conduction band and also some electrons from valence band jump to conduction band. It makes the number of electrons more in conduction band than the number of holes in valence band. So conduction takes place due to electrons. Whereas the acceptor energy level EA lies slightly above the top of the valence band. At room temperature, many electrons of the valence band get excited to these acceptor energy levels, leaving behind equal number of holes in the valence band. These holes can conduct current. Thus, the valence band has more holes than the electrons in the conduction band.
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