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