Fermi level and ionization in degenerately doped silicon

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Nicky302
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alright i juz want to say I am stucked in examples problem, the question is:

A semiconductor is said to be degenerately doped when n>-Nc or p>-Nv. assuming Maxwell Boltzmann statistics, determine the values of Nd and Na needed to obtain degenerately doped N- and P- type silicon. Where is the Fermi Level in a degenerately doped N-type and P-Type semiconductor? What happens to the ionisation probability of the dopant atoms?
 
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well i don't know the complete answer but i just know that in case of denerate N type semiconductor , fermi level moves into the conduction band. While in case of P type semiconductor it moves into valence band.