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Crystals 2019, 9(2), 68; https://doi.org/10.3390/cryst9020068

Effect of the Gaseous Atmosphere in GaAs Films Grown by Close-Spaced Vapor Transport Technique

1
IC-CIDS Benemérita Universidad Autónoma de Puebla, Ed. IC5, Col. San Manuel, Puebla C.P. 72570, Mexico
2
FCQ Benemérita Universidad Autónoma de Puebla, Ed. FCQ4, Col. San Manuel, Puebla C.P. 72570, Mexico
3
IFUAP, Benemérita Universidad Autónoma de Puebla, Ed. IF2, Col. San Manuel, Puebla C.P. 72570, Mexico
*
Author to whom correspondence should be addressed.
Received: 3 December 2018 / Revised: 15 January 2019 / Accepted: 18 January 2019 / Published: 28 January 2019
(This article belongs to the Special Issue Non-Classical Crystal Growth)
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Abstract

The effect of the gaseous atmosphere in the growth of gallium arsenide (GaAs) films was studied. The films have been grown by close-spaced vapor transport (CSVT) technique in a home-made hot filament chemical vapor deposition (HFCVD) reactor using molecular hydrogen and molecular nitrogen as the transport agent. An important point about the gaseous atmosphere is the ease in creating volatile compounds when it makes contact with the GaAs source, this favors the transport of material in a CSVT system. Chemical reactions are proposed in order to understand the significant difference produced from the gaseous atmosphere. The films grown with hydrogen are (almost) continuous and have homogeneous layers with preferential orientation (111). The films grown with nitrogen are granular and rough layers with the coexistence of the orientations (111), (220) and (311) in the crystals. The incorporation of impurities in the films was corroborated by energy dispersive spectroscopy (EDS) showing traces of oxygen and nitrogen for the case of the samples obtained with nitrogen. Films grown in a hydrogen atmosphere show a higher band gap than those grown in a nitrogen atmosphere. With the results of XRD and micro-Raman we observe a displacement and broadening of the peaks, characteristic of a structural disorder. The calculations of the FWHM allow us to observe the crystallinity degree and determine an approximate crystallite size using the Scherrer’s equation. View Full-Text
Keywords: CSVT; HFCVD; GaAs; films CSVT; HFCVD; GaAs; films
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Cruz Bueno, J.J.; García Salgado, G.; Balderas Valadez, R.F.; Luna López, J.A.; Nieto Caballero, F.G.; Díaz Becerril, T.; Rosendo Andrés, E.; Coyopol Solís, A.; Romano Trujillo, R.; Morales Ruiz, C.; Gracia Jiménez, J.M.; Galeazzi Isasmendi, R. Effect of the Gaseous Atmosphere in GaAs Films Grown by Close-Spaced Vapor Transport Technique. Crystals 2019, 9, 68.

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