Question

A $PN$- junction has a thickness of order of

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

Answer 1

The correct option is C ${10}^{-6}m$

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 ${10}^{-6}m$.