Question

The Group 3A/ Group 5A semiconductors are composed of equal amounts of atoms from Group 3A and Group 5A for example, InP and GaAs. These types of semiconductors are used in light-emitting diodes and solid-state lasers. What would you add to make a p-type semiconductor from pure GaAs? How would you dope pure GaAs to make an n-type semiconductor?

Short answer

When Zn is added to pure GaAs, it will make a p-type semiconductor, and when we dope Si with pure GaAs, it will make an n-type semiconductor.

Step-by-step solution

Given Information

Group 3A or Group 5A semiconductors are used in light-emitting diodes and solid-state lasers.

Concept Introduction

The p-type or n-type semiconductors are formed with the doping of the alien impurities in the intrinsic semiconductors.

Step 3: p-type semiconductor of GaAs

The p-type semiconductors are formed by adding an atom with lesser valence electrons than the original element.

Thus, if we add Zn from pure GaAs, it will form a p-type semiconductor.

n-type semiconductor of GaAs

In n-type semiconductors, the major portion is taken by the electrons, while the minor portion belongs to a number ofholes. The semiconductors are formed by dopingintrinsic semiconductorswith impure atoms.

Thus, if we dope Si with pure GaAs, it will form n-type semiconductors.