Consider a silicon wafer having Nc=2.8*10^19cm^-3 and the Fermi energy is .25eV below the conduction band. Calculate the equilibrium concentrations of electrons at T=300K?

Consider a silicon wafer having Nc=2.8*10^19cm^-3 and the Fermi energy is .25eV below the conduction band. Calculate the equilibrium concentrations of electrons at T=300K?

(a) 18*10^16cm^-3

(b) 1.8*10^16cm^-3

(c) 1.8*10^14cm^-3

(d) 180*10^16cm^-3

The question was asked during an interview for a job.

My question is based upon Charge Densities in a Semiconductor impurities topic in section Conduction in Semiconductors of Electronic Devices & Circuits

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Consider a silicon wafer having Nc=2.8*10^19cm^-3 and the Fermi energy is .25eV below the conduction band. Calculate the equilibrium concentrations of electrons at T=300K?

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