Question

A p-n junction has a thickness of the order of

• A. 1 cm
• B. 1 mm
• C. $10^{-6}cm$
• D. $10^{-12}cm$

Answer 1

Answer: (C)

When P- type semiconductor is mixed with $N$ - type semiconductor, PN - junction is formed. There is very small region $\{$ which is in order of micro metre $\}$.
This region is known as depletion region.
so, the thickness of PN - junction $\{$ depletion region $\}$ is in order of $10^{-6}m$.