# Gallium arsenide ( GaAs ) can also serve as a basis for a semiconductor. It has a structure similar to that of elemental silicon, but with alternating gallium and arsenic atoms. Draw an electron-dot type of diagram of a unit cell of GaAs as well as n-type and p-type substitutions for a semiconducting material based on GaAs . What can be substituted for Ga for each type of semiconductor? What can be substituted for As for each type of semiconductor?

### Physical Chemistry

2nd Edition
Ball + 3 others
ISBN: 9781133958437

Chapter
Section

### Physical Chemistry

2nd Edition
Ball + 3 others
ISBN: 9781133958437
Chapter 21, Problem 21.60E
Textbook Problem
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## Gallium arsenide ( GaAs ) can also serve as a basis for a semiconductor. It has a structure similar to that of elemental silicon, but with alternating gallium and arsenic atoms. Draw an electron-dot type of diagram of a unit cell of GaAs as well as n-type and p-type substitutions for a semiconducting material based on GaAs . What can be substituted for Ga for each type of semiconductor? What can be substituted for As for each type of semiconductor?

Interpretation Introduction

Interpretation:

The electron-dot type of diagram of a unit cell of GaAs as well as n-type and p-type substitutions for a semiconducting material based on GaAs is to be drawn. The atom which can be substituted for Ga and As for each type of semiconductor is to be stated.

Concept introduction:

Semiconductors are a type of conductors that have conductance in-between good conductors and insulators. There are two types of semiconductor p-type semiconductor and an n-type semiconductor. The p-type semiconductor has a hole to conduct electricity and n-type semiconductor has electrons to conduct electricity.

### Explanation of Solution

The structure of GaAs is similar to that of elemental silicon. The elemental silicon has face-centered cubic type structure. The structure of GaAs is shown below.

Figure 1

The outer atoms represent Ga atoms and the inner tetrahedral atoms represent the As atoms. The gallium has three electrons in its valence shell and arsenic has five valence electrons in its valence shell, such that the gallium forms three covalent bonds and one coordinate bond.

The n-type semiconductor is formed by doping of Ga by the atom which has one more electrons. Thus, germanium, which has four electrons in the valence shell, can be used as a dopant to form the n-type semiconductor. The extra electron acts as the carrier. The structure of n-type semiconductor is,

Figure 2

The n-type semiconductor can also be formed by doping of As by the atom which has one more electron

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