Chapter 15, Problem 15E.5P

Interpretation Introduction

Interpretation:

The variation of conductivity of n-type semiconductor with temperature has to be explained.

Concept Introduction:

Semiconductors are those materials which has an ability to control the flow of charge carrier in it.  There are mainly two type semiconductors; intrinsic and extrinsic semiconductors.  In extrinsic semiconductor an impurity is added to improve the conductivity.  Extrinsic semiconductor is classified as p-type semiconductor and n-type semiconductor depending on the carriers present in it.

p-type semiconductor: If a group $14$ elements is doped with atoms of group $13$ elements, then an electron can be transferred from ${14}^{th}$ group element to ${13}^{th}$ group element by creating a hole in the valence band which increases the conductivity.  These types of semiconductors are called p-type semiconductors.

n-type semiconductor: If ${15}^{th}$ group elements are used as dopant for ${14}^{th}$ group elements an electron will be transferred to conduction band results in increase in conductivity.  These types of semiconductors are called n-type semiconductors.