Chapter 7, Problem 29E

Interpretation Introduction

Interpretation:

There are two types of semiconductor intrinsic semiconductor and extrinsic semiconductor. Intrinsic semiconductor is pure form of semiconductor $\left(\text{Si or Ge}\right)$ but in extrinsic semiconductor small amount of trivalent or pentavalent impurity is added to increase the conductivity.

Trivalent atom like $\text{Indium }\left(In\right).\text{ Boron}\left(B\right)\text{ Aluminium}\left(Al\right)$ etc

Pentavalent atom like $\text{Arsenic}\left(As\right),\text{ Antimony}\left(Sb\right),\text{ Phosphorous}\left(P\right)$ etc

Concept introduction: Add impurity $\left(\text{trivalent or pentavalent}\right)$ to change the number of charge carriers, and to increase conductivity.

To determine: doping can increase the conductivity of a semiconductor.