There are two types of semiconductor intrinsic semiconductor and extrinsic semiconductor. Intrinsic semiconductor is pure form of semiconductor ( Si or Ge ) but in extrinsic semiconductor small amount of trivalent or pentavalent impurity is added to increase the conductivity. Trivalent atom like Indium ( I n ) . Boron ( B ) Aluminium ( A l ) etc Pentavalent atom like Arsenic ( A s ) , Antimony ( S b ) , Phosphorous ( P ) etc Concept introduction: Add impurity ( trivalent or pentavalent ) to change the number of charge carriers, and to increase conductivity. To determine: doping can increase the conductivity of a semiconductor.

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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 $(Si or Ge)$ but in extrinsic semiconductor small amount of trivalent or pentavalent impurity is added to increase the conductivity.

Trivalent atom like $Indium (I n) . Boron (B) Aluminium (A l)$ etc

Pentavalent atom like $Arsenic (A s), Antimony (S b), Phosphorous (P)$ etc

Concept introduction: Add impurity $(trivalent or pentavalent)$ to change the number of charge carriers, and to increase conductivity.

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

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