Question

Which of the following equations represent the correct expression for the band diagram of the p-n junction? (E1=difference between the fermi level of material and conduction band of n material and E2=difference between the conduction band of n material and fermi level of n material)

(a) Ecn – E f = (1/2)*EG – E1

(b) Ecn – E f = (1/2)*EG – E2

(c) Ef – Ecp = (1/2)*EG – E1

(d) Ecn – Ef = (1/2)*EG + E1

The question was posed to me in an interview for job.

The question is from Band Structure of an Open-Circuited p-n junction in chapter Semiconductor-Diode Characteristics of Electronic Devices & Circuits

Answer 1

Right option is (a) Ecn – E f = (1/2)*EG – E1

For explanation: From the energy band diagram of the p-n junction, the option ‘a’ satisfies that band diagram.