a)
electron concentration= 1e+15 cm^-3
hole concentration= 2.1e+05 cm^-3
Fermi level w.r.t intrinsic fermi level= 0.279 eV
b)
electron concentration= 1e+15 cm^-3
hole concentration= 1e+12 cm^-3
Quasi fermi level for n-type carrier= 0.279 eV
Quasi fermi level for p-type carrier= 0.11 eV
c)
electron concentration= 1e+18 cm^-3
hole concentration= 1e+18 cm^-3
Quasi fermi level for n-type carrier= 0.45 eV
Quasi fermi level for p-type carrier= 0.45 eV