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Molecular Beam Epitaxy
book

Molecular Beam Epitaxy

by Hajime Asahi, Yoshiji Horikoshi
April 2019
Intermediate to advanced content levelIntermediate to advanced
512 pages
17h 52m
English
Wiley
Content preview from Molecular Beam Epitaxy

14Molecular‐Beam Epitaxy of Antimonides for Optoelectronic Devices

Eric Tournie

IES, Université de Montpellier, CNRS, F‐34000 Montpellier, France

14.1 Introduction

Among III–V semiconductors the so‐called “antimonides” refer to the Sb‐rich III–V compounds. They include GaSb, InSb, and AlSb which can all be alloyed with InAs to form ternary, quaternary, or even quinary alloys closely lattice‐matched to GaSb or InAs substrates. Figure 14.1 shows that the III–Sb multinary materials span a large bandgap range from 0.1 eV up to 1.8 eV while still being nearly lattice‐matched to GaSb. In addition, the positions of the band edges, displayed in Figure 14.2 for the III–As and III–Sb binary compounds, reveal that III–Sbs offer the opportunity to realize a large variety of band alignments, from type‐I, where electron and holes are confined in the same material (e.g. AlGaSb/GaSb, GaSb/GaInSb), to type‐III, also known as staggered type‐II or broken‐gap type II, where the conduction band of one material is located below the valence band of the next one (e.g. GaSb/InAs) through type‐II systems (e.g. AlSb/InAs). Finally, it is noticeable that III–Sbs exhibit high carrier mobilities. InSb and GaSb have, respectively, the highest electron and hole mobilities among all compound semiconductors, while InAs has the second highest electron mobility [1].

Graph of energy gap vs. lattice parameter of various semiconductors, with open and closed circles representing indirect and direct, respectively, labeled ZnSe, CdS, etc., with others connected by lines.

Figure 14.1 Energy gap vs. lattice parameter of various ...

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Publisher Resources

ISBN: 9781119355014Purchase book