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Crystals 2017, 7(6), 155; doi:10.3390/cryst7060155

Effects of In0.82Ga0.18As/InP Double Buffers Design on the Microstructure of the In0.82G0.18As/InP Heterostructure

1
Key Lab of Automobile Materials Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130025, China
2
State Key Lab for Mechanical Behavior of Materials, College of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
*
Author to whom correspondence should be addressed.
Academic Editor: Xiaohong Tang
Received: 10 April 2017 / Revised: 16 May 2017 / Accepted: 22 May 2017 / Published: 25 May 2017
(This article belongs to the Special Issue Epitaxial Growth of Semiconductor Nanostructures)
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Abstract

In order to reduce the dislocation density and improve the performance of high indium content In0.82Ga0.18As films, the design of double buffer layers has been introduced into the In0.82Ga0.18As/InP heterostructure. Compared with other buffer layer structures, we introduce an InP thin layer, which is the same as the substrate, into the In0.82Ga0.18As/InP heterostructure. The epitaxial layers and buffer layers were grown by the low-pressure metalorganic chemical vapor deposition (LP-MOCVD) method. In this study, the surface morphology and microstructures of the heterostructure were investigated by SEM, AFM, XRD and TEM. The residual strains of the In0.82Ga0.18As epitaxial layer in different samples were studied by Raman spectroscopy. The residual strain of the In0.82Ga0.18As epitaxial layer was decreased by designing double buffer layers which included an InP layer; as a result, dislocations in the epitaxial layer were effectively suppressed since the dislocation density was notably reduced. Moreover, the performance of In0.82Ga0.18As films was investigated using the Hall test, and the results are in line with our expectations. By comparing different buffer layer structures, we explained the mechanism of dislocation density reduction by using double buffer layers, which included a thin InP layer. View Full-Text
Keywords: In0.82Ga0.18As; semiconductor III–V materials; epitaxy growth; MOCVD; InP buffer layer; dislocation density In0.82Ga0.18As; semiconductor III–V materials; epitaxy growth; MOCVD; InP buffer layer; dislocation density
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhao, L.; Guo, Z.; Ding, X.; Li, J.; Yang, S.; Zhang, M.; Zhao, L. Effects of In0.82Ga0.18As/InP Double Buffers Design on the Microstructure of the In0.82G0.18As/InP Heterostructure. Crystals 2017, 7, 155.

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