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The Fermi level for an extrinsic ‘n’ type semiconductor:
- a)Lies towards the conduction band
- b)Lies mid-way between the valence band and conduction band
- c)Does not exist
- d)Lies towards the valence band
Correct answer is option 'A'. Can you explain this answer?
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The Fermi level for an extrinsic ‘n’ type semiconductor:a)...
Fermi level in a semiconductor: It is that energy level in the energy-band-diagram of semiconductor for which the probability of occupancy (i.e., the presence of main current carriers electrons or holes) becomes half.
From the above diagram, it is clear that the Fermi level is close to the conduction band edge.
- As Temperature increases then the fermi level moves towards the centre of forbidden gap irrespective of whether it is p-type or n-type.
- For n-type material as the doping increases then fermi level moves towards the conduction band.
- For p-type material as the doping increases then fermi level moves towards the valence band.
- If doping is very large, then the Fermi level may move into the conduction band.
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The Fermi level for an extrinsic ‘n’ type semiconductor:a)Lies towards the conduction bandb)Lies mid-way between the valence band and conduction bandc)Does not existd)Lies towards the valence bandCorrect answer is option 'A'. Can you explain this answer?
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