Chapter 12, Problem 24PS

Interpretation Introduction

Interpretation:

Aluminum-doped silicon is a p-type or n-type semiconductor has to be identified and the conductivity occurs in this semiconductor has to be explained.

Concept introduction:

P-type semiconductor:

When the trivalent impurity is added to an intrinsic or pure semiconductor (silicon or germanium) is called as p-type semiconductor. Boron (B), Gallium (G), Indium (In), Aluminium (Al) etc. are trivalent impurities and which are called acceptor impurity.

N-type semiconductor:

When pentavalent impurity is added to an intrinsic or pure semiconductor (silicon or germanium) is called as n-type semiconductor. Phosphorus, arsenic, antimony etc are pentavalent impurities which are called donor impurity.