Solid State Physics- Finding concentration of donor atoms (Nd)

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Homework Statement



Silicon at T= 300K contains acceptor atoms at a concentration of Na = 5*10^15 cm-3. Donor atoms are added forming an n-type compensated semiconductor such that the fermi level is 0.215 eV below the conduction band edge. What concentration of donor atoms are added?


Homework Equations


I have one equation byt i still have one unknown:





The Attempt at a Solution



here is what i have:
(ni^2) = (Nd- 5*10^15) * po
 

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