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. 2022 Nov 23;24(12):1711.
doi: 10.3390/e24121711.

Isotherm Theoretical Study of the AlxGa1-xAsySb1-y Quaternary Alloy Using the Regular Solution Approximation for Its Possible Growth via Liquid-Phase Epitaxy at Low Temperatures

Erick Gastellóu  1   2 , Rafael García  2 , Ana M Herrera  2 , Antonio Ramos  2 , Godofredo García  3 , Mario Robles  1 , Jorge A Rodríguez  1 , Yani D Ramírez  4 , Roberto C Carrillo  5
Affiliations

Isotherm Theoretical Study of the AlxGa1-xAsySb1-y Quaternary Alloy Using the Regular Solution Approximation for Its Possible Growth via Liquid-Phase Epitaxy at Low Temperatures

Erick Gastellóu et al. Entropy (Basel). .

Abstract

This work presents the theoretical calculation of isotherm diagrams for quaternary alloys of III-V semiconductor compounds with the form IIIxIII1-xVyV1-y. In particular, the isotherm diagrams for the AlxGa1-xAsySb1-y quaternary alloy at low temperatures were calculated (500 °C, 450 °C, 400 °C, and 350 °C). The AlxGa1-xAsySb1-y quaternary alloy was formed from four binary compounds such as GaAs, AlAs, AlSb, and GaSb, all with direct bandgaps. The regular solution approximation was used to find the quaternary isotherm diagrams, represented in four linearly independent equations, which were solved using Parametric Technology Corporation Mathcad 14.0 software for different arsenic and antimony atomic fractions. The results support the possible growth of layers via liquid-phase epitaxy in a range of temperatures from 500 °C to 350 °C, where the crystalline quality could be improved at low temperatures. These semiconductor layers could have applications for optoelectronic devices in photonic communications, thermophotovoltaic systems, and microwave devices with good crystalline quality.

Keywords: LPE; isotherm diagram; regular solution approximation; semiconductor compound.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Liquid-phase epitaxy system: (a) sliding graphite boat; (b) quartz manipulator; (c) LPE system chamber.
Figure 2
Figure 2
Isotherm diagrams of the AlxGa1−xAsySb1−y quaternary alloy at low temperatures indicating its possible growth via liquid-phase epitaxy.
Figure 3
Figure 3
Atomic fractions in solids x and y as a function of the arsenic atomic fraction in the liquid xAsl for different temperatures: (a) 500 °C, (b) 450 °C, (c) 400 °C, and (d) 350 °C.
See this image and copyright information in PMC

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