Question

Write a short note on N type semiconductor.

Answer 1

When a small amount of $Pentavalent$ $Impurities$is added to a pure semiconductor providing a large number of free electrons in it, the extrinsic semiconductor thus formed is known as $n-Type$ $Semi$$Conductor.$ The conduction in the n-type semiconductor is because of the free electrons denoted by the pentavalent impurity atoms. These electrons are the excess free electrons with regards to the number of free electrons required to fill the covalent bonds in the semiconductors.