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Substrate and Mg doping effects in GaAs nanowires

Mg doping of GaAs nanowires has been established as a viable alternative to Be doping in order to achieve p-type electrical conductivity. Although reports on the optical properties are available, few reports exist about the physical properties of intermediate-to-high Mg doping in GaAs nanowires grow...

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Autores principales: Kannappan, Perumal, Sedrine, Nabiha Ben, Teixeira, Jennifer P, Soares, Maria R, Falcão, Bruno P, Correia, Maria R, Cifuentes, Nestor, Viana, Emilson R, Moreira, Marcus V B, Ribeiro, Geraldo M, de Oliveira, Alfredo G, González, Juan C, Leitão, Joaquim P
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5647700/
https://www.ncbi.nlm.nih.gov/pubmed/29090114
http://dx.doi.org/10.3762/bjnano.8.212
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author Kannappan, Perumal
Sedrine, Nabiha Ben
Teixeira, Jennifer P
Soares, Maria R
Falcão, Bruno P
Correia, Maria R
Cifuentes, Nestor
Viana, Emilson R
Moreira, Marcus V B
Ribeiro, Geraldo M
de Oliveira, Alfredo G
González, Juan C
Leitão, Joaquim P
author_facet Kannappan, Perumal
Sedrine, Nabiha Ben
Teixeira, Jennifer P
Soares, Maria R
Falcão, Bruno P
Correia, Maria R
Cifuentes, Nestor
Viana, Emilson R
Moreira, Marcus V B
Ribeiro, Geraldo M
de Oliveira, Alfredo G
González, Juan C
Leitão, Joaquim P
author_sort Kannappan, Perumal
collection PubMed
description Mg doping of GaAs nanowires has been established as a viable alternative to Be doping in order to achieve p-type electrical conductivity. Although reports on the optical properties are available, few reports exist about the physical properties of intermediate-to-high Mg doping in GaAs nanowires grown by molecular beam epitaxy (MBE) on GaAs(111)B and Si(111) substrates. In this work, we address this topic and present further understanding on the fundamental aspects. As the Mg doping was increased, structural and optical investigations revealed: i) a lower influence of the polytypic nature of the GaAs nanowires on their electronic structure; ii) a considerable reduction of the density of vertical nanowires, which is almost null for growth on Si(111); iii) the occurrence of a higher WZ phase fraction, in particular for growth on Si(111); iv) an increase of the activation energy to release the less bound carrier in the radiative state from nanowires grown on GaAs(111)B; and v) a higher influence of defects on the activation of nonradiative de-excitation channels in the case of nanowires only grown on Si(111). Back-gate field effect transistors were fabricated with individual nanowires and the p-type electrical conductivity was measured with free hole concentration ranging from 2.7 × 10(16) cm(−3) to 1.4 × 10(17) cm(−3). The estimated electrical mobility was in the range ≈0.3–39 cm(2)/Vs and the dominant scattering mechanism is ascribed to the WZ/ZB interfaces. Electrical and optical measurements showed a lower influence of the polytypic structure of the nanowires on their electronic structure. The involvement of Mg in one of the radiative transitions observed for growth on the Si(111) substrate is suggested.
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spelling pubmed-56477002017-10-31 Substrate and Mg doping effects in GaAs nanowires Kannappan, Perumal Sedrine, Nabiha Ben Teixeira, Jennifer P Soares, Maria R Falcão, Bruno P Correia, Maria R Cifuentes, Nestor Viana, Emilson R Moreira, Marcus V B Ribeiro, Geraldo M de Oliveira, Alfredo G González, Juan C Leitão, Joaquim P Beilstein J Nanotechnol Full Research Paper Mg doping of GaAs nanowires has been established as a viable alternative to Be doping in order to achieve p-type electrical conductivity. Although reports on the optical properties are available, few reports exist about the physical properties of intermediate-to-high Mg doping in GaAs nanowires grown by molecular beam epitaxy (MBE) on GaAs(111)B and Si(111) substrates. In this work, we address this topic and present further understanding on the fundamental aspects. As the Mg doping was increased, structural and optical investigations revealed: i) a lower influence of the polytypic nature of the GaAs nanowires on their electronic structure; ii) a considerable reduction of the density of vertical nanowires, which is almost null for growth on Si(111); iii) the occurrence of a higher WZ phase fraction, in particular for growth on Si(111); iv) an increase of the activation energy to release the less bound carrier in the radiative state from nanowires grown on GaAs(111)B; and v) a higher influence of defects on the activation of nonradiative de-excitation channels in the case of nanowires only grown on Si(111). Back-gate field effect transistors were fabricated with individual nanowires and the p-type electrical conductivity was measured with free hole concentration ranging from 2.7 × 10(16) cm(−3) to 1.4 × 10(17) cm(−3). The estimated electrical mobility was in the range ≈0.3–39 cm(2)/Vs and the dominant scattering mechanism is ascribed to the WZ/ZB interfaces. Electrical and optical measurements showed a lower influence of the polytypic structure of the nanowires on their electronic structure. The involvement of Mg in one of the radiative transitions observed for growth on the Si(111) substrate is suggested. Beilstein-Institut 2017-10-11 /pmc/articles/PMC5647700/ /pubmed/29090114 http://dx.doi.org/10.3762/bjnano.8.212 Text en Copyright © 2017, Kannappan et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Kannappan, Perumal
Sedrine, Nabiha Ben
Teixeira, Jennifer P
Soares, Maria R
Falcão, Bruno P
Correia, Maria R
Cifuentes, Nestor
Viana, Emilson R
Moreira, Marcus V B
Ribeiro, Geraldo M
de Oliveira, Alfredo G
González, Juan C
Leitão, Joaquim P
Substrate and Mg doping effects in GaAs nanowires
title Substrate and Mg doping effects in GaAs nanowires
title_full Substrate and Mg doping effects in GaAs nanowires
title_fullStr Substrate and Mg doping effects in GaAs nanowires
title_full_unstemmed Substrate and Mg doping effects in GaAs nanowires
title_short Substrate and Mg doping effects in GaAs nanowires
title_sort substrate and mg doping effects in gaas nanowires
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5647700/
https://www.ncbi.nlm.nih.gov/pubmed/29090114
http://dx.doi.org/10.3762/bjnano.8.212
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