Question

The band diagrams of three semiconductors are given in the figure. From left to right they are respectively.

• A. n-intrinsic-p
• B. p-intrinsic-n
• C. intrinsic-p-n
• D. intrinsic-n-p

Answer 1

Answer: (A)

n-intrinsic-p

In the diagrams $\text{C}$, $\text{V}$ & $\text{Ef}$ represents the conduction band, the valence band, and the Fermi level.

For $\text{n -}$type semiconductor, the Fermi level is near the conduction band.

For $\text{p -}$type semiconductor, the Fermi level is near the valence band.

For intrinsic semiconductor, the Fermi level lies in the middle.